diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..70caab9
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,13 @@
+root = true
+
+[*.php]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+trim_trailing_whitespace = true
+
+[*.yml]
+indent_size = 2
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e85fd86..aac0da5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,20 +1,26 @@
 name: CI
 
-on: [push]
+on: [ push ]
 
 jobs:
-  build-test:
+  check:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-    - name: PHP Composer
-      uses: php-actions/composer@v6
-      with:
-        php_version: 8.1
-        php_extensions: "bcmath"
-    - name: PHPUnit tests
-      uses: php-actions/phpunit@v3
-      with:
-        version: 8.5
-        php_version: 8.1
+      - name: Checkout project
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+        with:
+          php_version: 8.1
+          php_extensions: "bcmath"
+
+      - name: Check formatting
+        run: ./vendor/bin/ecs check
+
+      - name: Run tests
+        uses: php-actions/phpunit@v3
+        with:
+          version: 8.5
+          php_version: 8.1
diff --git a/.gitignore b/.gitignore
index c981c1b..36fca47 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,4 @@
 /vendor
 composer.lock
 *.cache
-/temp
\ No newline at end of file
+/temp
diff --git a/README.md b/README.md
index c85c1a9..c77c1ca 100644
--- a/README.md
+++ b/README.md
@@ -34,3 +34,11 @@ Dev Docs
 --------
 
 * [Setup PIN Tan Account in AqBanking (German)](https://www.aquamaniac.de/rdm/projects/aqbanking/wiki/SetupPinTan)
+
+### Coding standards
+
+Run the fixer before push.
+
+```shell
+./vendor/bin/ecs --fix
+```
diff --git a/composer.json b/composer.json
index 3355dfd..2545366 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,8 @@
     "require-dev": {
         "phpunit/phpunit": "^8.5",
         "mockery/mockery": "*",
-        "mikey179/vfsstream": "^1.6"
+        "mikey179/vfsstream": "^1.6",
+        "symplify/easy-coding-standard": "^12.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/ecs.php b/ecs.php
new file mode 100644
index 0000000..c31a2fe
--- /dev/null
+++ b/ecs.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+use PhpCsFixer\Fixer\ClassNotation\OrderedClassElementsFixer;
+use PhpCsFixer\Fixer\ControlStructure\YodaStyleFixer;
+use PhpCsFixer\Fixer\FunctionNotation\NativeFunctionInvocationFixer;
+use PhpCsFixer\Fixer\Import\NoUnusedImportsFixer;
+use PhpCsFixer\Fixer\Strict\StrictComparisonFixer;
+use Symplify\EasyCodingStandard\Config\ECSConfig;
+use Symplify\EasyCodingStandard\ValueObject\Set\SetList;
+
+return function (ECSConfig $ecsConfig): void {
+    $ecsConfig->paths([
+        __DIR__ . '/ecs.php',
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ]);
+
+    $ecsConfig->rules([
+        NoUnusedImportsFixer::class,
+        StrictComparisonFixer::class,
+        YodaStyleFixer::class,
+        OrderedClassElementsFixer::class,
+        NativeFunctionInvocationFixer::class,
+    ]);
+
+    $ecsConfig->sets([
+        SetList::PSR_12,
+        SetList::ARRAY,
+        SetList::SPACES,
+        SetList::DOCBLOCK,
+        SetList::NAMESPACES,
+        SetList::COMMENTS,
+    ]);
+};
diff --git a/src/Account.php b/src/Account.php
index ae06094..15fbd86 100644
--- a/src/Account.php
+++ b/src/Account.php
@@ -20,7 +20,6 @@ class Account implements AccountInterface, Arrayable
     private $accountHolderName;
 
     /**
-     * @param BankCode $bankCode
      * @param string $accountNumber
      * @param string $accountHolderName
      * @return \AqBanking\Account
@@ -61,7 +60,7 @@ public function toArray()
         return [
             'bankCode' => $this->getBankCode()->getString(),
             'accountHolderName' => $this->getAccountHolderName(),
-            'accountNumber' => $this->getAccountNumber()
+            'accountNumber' => $this->getAccountNumber(),
         ];
     }
 }
diff --git a/src/AccountMatcher.php b/src/AccountMatcher.php
index 1a3b4e4..b55e2fc 100644
--- a/src/AccountMatcher.php
+++ b/src/AccountMatcher.php
@@ -2,7 +2,6 @@
 
 namespace AqBanking;
 
-use AqBanking\Command\GetAccountsCommand;
 use AqBanking\Command\ListAccountsCommand;
 
 /**
@@ -25,14 +24,13 @@ public function getExistingAccount(Account $account)
     {
         foreach ($this->array as $record) {
             if (
-                $account->getBankCode()->getString() == $record[ListAccountsCommand::BANK] &&
-                $account->getAccountNumber() == $record[ListAccountsCommand::NUMBER]
+                $account->getBankCode()->getString() === $record[ListAccountsCommand::BANK] &&
+                $account->getAccountNumber() === $record[ListAccountsCommand::NUMBER]
             ) {
-                return new ExistingAccount($account, $record[ListAccountsCommand::UNIQUE_ID] );
+                return new ExistingAccount($account, $record[ListAccountsCommand::UNIQUE_ID]);
             }
         }
 
         return null;
     }
 }
-
diff --git a/src/Balance.php b/src/Balance.php
index 369d6e0..822a10d 100644
--- a/src/Balance.php
+++ b/src/Balance.php
@@ -64,7 +64,7 @@ public function toArray()
                 'priceUnit' => 100,
                 'currency' => $this->getValue()->getCurrency()->getCode(),
             ],
-            'date' => $this->getDate()->format('Y-m-d')
+            'date' => $this->getDate()->format('Y-m-d'),
         ];
     }
 }
diff --git a/src/Bank.php b/src/Bank.php
index 16d8b07..2d02fd7 100644
--- a/src/Bank.php
+++ b/src/Bank.php
@@ -20,9 +20,7 @@ class Bank
     private $hbciVersion;
 
     /**
-     * @param BankCode $bankCode
      * @param string $hbciUrl
-     * @param HbciVersion|null $hbciVersion
      */
     public function __construct(BankCode $bankCode, $hbciUrl, HbciVersion $hbciVersion = null)
     {
diff --git a/src/Command/AbstractCommand.php b/src/Command/AbstractCommand.php
index 916841d..916facc 100644
--- a/src/Command/AbstractCommand.php
+++ b/src/Command/AbstractCommand.php
@@ -4,11 +4,6 @@
 
 abstract class AbstractCommand
 {
-    /**
-     * @var null|ShellCommandExecutor
-     */
-    private $shellCommandExecutor = null;
-
     /**
      * @var string
      */
@@ -25,25 +20,15 @@ abstract class AbstractCommand
     protected $pathToAqHBCIToolBinary = 'aqhbci-tool4';
 
     /**
-     * @param ShellCommandExecutor $shellCommandExecutor
+     * @var null|ShellCommandExecutor
      */
+    private $shellCommandExecutor = null;
+
     public function setShellCommandExecutor(ShellCommandExecutor $shellCommandExecutor)
     {
         $this->shellCommandExecutor = $shellCommandExecutor;
     }
 
-    /**
-     * @return ShellCommandExecutor
-     */
-    protected function getShellCommandExecutor()
-    {
-        if (null === $this->shellCommandExecutor) {
-            $this->shellCommandExecutor = new ShellCommandExecutor();
-        }
-
-        return $this->shellCommandExecutor;
-    }
-
     /**
      * @param string $binaryPath
      */
@@ -67,4 +52,16 @@ public function setPathToAqHBCIToolBinary($pathToAqHBCIToolBinary)
     {
         $this->pathToAqHBCIToolBinary = $pathToAqHBCIToolBinary;
     }
+
+    /**
+     * @return ShellCommandExecutor
+     */
+    protected function getShellCommandExecutor()
+    {
+        if (null === $this->shellCommandExecutor) {
+            $this->shellCommandExecutor = new ShellCommandExecutor();
+        }
+
+        return $this->shellCommandExecutor;
+    }
 }
diff --git a/src/Command/AddAccountFlagsCommand.php b/src/Command/AddAccountFlagsCommand.php
index 0bd5654..3fc4ec3 100644
--- a/src/Command/AddAccountFlagsCommand.php
+++ b/src/Command/AddAccountFlagsCommand.php
@@ -2,15 +2,13 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\Account;
 use AqBanking\ExistingAccount;
 
 class AddAccountFlagsCommand extends AbstractCommand
 {
-    const FLAG_PREFER_CAMT_DOWNLOAD = 'preferCamtDownload';
+    public const FLAG_PREFER_CAMT_DOWNLOAD = 'preferCamtDownload';
 
     public function execute(ExistingAccount $account, $flags)
     {
diff --git a/src/Command/AddUserCommand.php b/src/Command/AddUserCommand.php
index 37cb2be..12b04eb 100644
--- a/src/Command/AddUserCommand.php
+++ b/src/Command/AddUserCommand.php
@@ -9,10 +9,9 @@
 
 class AddUserCommand extends AbstractCommand
 {
-    const RETURN_VAR_USER_ALREADY_EXISTS = 3;
+    public const RETURN_VAR_USER_ALREADY_EXISTS = 3;
 
     /**
-     * @param User $user
      * @throws AddUserCommand\UserAlreadyExistsException
      * @throws ShellCommandExecutor\DefectiveResultException
      */
diff --git a/src/Command/AddUserCommand/UserAlreadyExistsException.php b/src/Command/AddUserCommand/UserAlreadyExistsException.php
index 1005fea..9c4d418 100644
--- a/src/Command/AddUserCommand/UserAlreadyExistsException.php
+++ b/src/Command/AddUserCommand/UserAlreadyExistsException.php
@@ -3,4 +3,5 @@
 namespace AqBanking\Command\AddUserCommand;
 
 class UserAlreadyExistsException extends \Exception
-{}
+{
+}
diff --git a/src/Command/AddUserFlagsCommand.php b/src/Command/AddUserFlagsCommand.php
index 8fbc11b..c9d799a 100644
--- a/src/Command/AddUserFlagsCommand.php
+++ b/src/Command/AddUserFlagsCommand.php
@@ -2,7 +2,6 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
 use AqBanking\ExistingUser;
@@ -10,7 +9,7 @@
 
 class AddUserFlagsCommand extends AbstractCommand
 {
-    const FLAG_SSL_QUIRK_IGNORE_PREMATURE_CLOSE = 'tlsIgnPrematureClose';
+    public const FLAG_SSL_QUIRK_IGNORE_PREMATURE_CLOSE = 'tlsIgnPrematureClose';
 
     /**
      * @deperacted no longer supported in AqBanking 6
diff --git a/src/Command/CheckAqBankingCommand.php b/src/Command/CheckAqBankingCommand.php
index 9199910..b66bbea 100644
--- a/src/Command/CheckAqBankingCommand.php
+++ b/src/Command/CheckAqBankingCommand.php
@@ -31,13 +31,15 @@ private function assertAqBankingIsAppropriateVersion()
 
         if (0 !== $result->getReturnVar()) {
             throw new AqBankingVersionTooOldException(
-                'Required version: ' . $minVersion . ' - present version: unknown');
+                'Required version: ' . $minVersion . ' - present version: unknown'
+            );
         }
 
         $versionString = $result->getOutput()[0];
         if (version_compare($versionString, $minVersion) < 0) {
             throw new AqBankingVersionTooOldException(
-                'Required version: ' . $minVersion . ' - present version: ' . $versionString);
+                'Required version: ' . $minVersion . ' - present version: ' . $versionString
+            );
         }
     }
 }
diff --git a/src/Command/CheckAqBankingCommand/AqBankingNotRespondingException.php b/src/Command/CheckAqBankingCommand/AqBankingNotRespondingException.php
index f04c7f9..a7aa83d 100644
--- a/src/Command/CheckAqBankingCommand/AqBankingNotRespondingException.php
+++ b/src/Command/CheckAqBankingCommand/AqBankingNotRespondingException.php
@@ -3,4 +3,5 @@
 namespace AqBanking\Command\CheckAqBankingCommand;
 
 class AqBankingNotRespondingException extends \Exception
-{}
+{
+}
diff --git a/src/Command/CheckAqBankingCommand/AqBankingVersionTooOldException.php b/src/Command/CheckAqBankingCommand/AqBankingVersionTooOldException.php
index 92b7993..b52e6fd 100644
--- a/src/Command/CheckAqBankingCommand/AqBankingVersionTooOldException.php
+++ b/src/Command/CheckAqBankingCommand/AqBankingVersionTooOldException.php
@@ -3,4 +3,5 @@
 namespace AqBanking\Command\CheckAqBankingCommand;
 
 class AqBankingVersionTooOldException extends \Exception
-{}
+{
+}
diff --git a/src/Command/GetAccSepaCommand.php b/src/Command/GetAccSepaCommand.php
index 1bfcd2a..df2ac26 100644
--- a/src/Command/GetAccSepaCommand.php
+++ b/src/Command/GetAccSepaCommand.php
@@ -2,10 +2,8 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\Account;
 use AqBanking\ExistingAccount;
 use AqBanking\PinFile\PinFile;
 
diff --git a/src/Command/GetAccountsCommand.php b/src/Command/GetAccountsCommand.php
index f637b3e..aa9383d 100644
--- a/src/Command/GetAccountsCommand.php
+++ b/src/Command/GetAccountsCommand.php
@@ -4,14 +4,13 @@
 
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\PinFile\PinFileInterface as PinFile;
 use AqBanking\ExistingUser;
+use AqBanking\PinFile\PinFileInterface as PinFile;
 
 class GetAccountsCommand extends AbstractCommand
 {
     /**
      * @param User $user
-     * @param PinFile $pinFile
      * @throws ShellCommandExecutor\DefectiveResultException
      */
     public function execute(ExistingUser $user, PinFile $pinFile)
diff --git a/src/Command/GetSysIDCommand.php b/src/Command/GetSysIDCommand.php
index e410167..67c7658 100644
--- a/src/Command/GetSysIDCommand.php
+++ b/src/Command/GetSysIDCommand.php
@@ -4,14 +4,13 @@
 
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\PinFile\PinFileInterface as PinFile;
 use AqBanking\ExistingUser;
+use AqBanking\PinFile\PinFileInterface as PinFile;
 
 class GetSysIDCommand extends AbstractCommand
 {
     /**
      * @param User $user
-     * @param PinFile $pinFile
      * @throws ShellCommandExecutor\DefectiveResultException
      */
     public function execute(ExistingUser $user, PinFile $pinFile)
diff --git a/src/Command/ListAccountsCommand.php b/src/Command/ListAccountsCommand.php
index d8a29da..dad448e 100644
--- a/src/Command/ListAccountsCommand.php
+++ b/src/Command/ListAccountsCommand.php
@@ -2,18 +2,16 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
-use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
-use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\User;
-
 class ListAccountsCommand extends AbstractCommand
 {
-    const RETURN_VAR_NOT_FOUND = 4;
+    public const RETURN_VAR_NOT_FOUND = 4;
+
+    public const BANK = 'bank';
+
+    public const NUMBER = 'number';
+
+    public const UNIQUE_ID = 'uniqueId';
 
-    const BANK = 'bank';
-    const NUMBER = 'number';
-    const UNIQUE_ID = 'uniqueId';
     /**
      * @return array
      */
@@ -26,7 +24,7 @@ public function execute()
 
         $result = $this->getShellCommandExecutor()->execute($shellCommand);
 
-        if ($result->getReturnVar() !== 0) {
+        if (0 !== $result->getReturnVar()) {
             throw new \RuntimeException(
                 'AqBanking exited with errors: ' . PHP_EOL
                 . implode(PHP_EOL, $result->getErrors())
@@ -34,8 +32,8 @@ public function execute()
         }
 
         $accounts = [];
-        foreach($result->getOutput() as $line) {
-            $parsed = sscanf($line, 'Account %d: Bank: %s Account Number: %s  SubAccountId: %s  Account Type: %s LocalUniqueId: %d' );
+        foreach ($result->getOutput() as $line) {
+            $parsed = sscanf($line, 'Account %d: Bank: %s Account Number: %s  SubAccountId: %s  Account Type: %s LocalUniqueId: %d');
             $accounts[] = [
                 self::BANK => $parsed[1],
                 self::NUMBER => $parsed[2],
diff --git a/src/Command/ListUsersCommand.php b/src/Command/ListUsersCommand.php
index 5c8ba41..e86e83b 100644
--- a/src/Command/ListUsersCommand.php
+++ b/src/Command/ListUsersCommand.php
@@ -2,14 +2,9 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
-use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
-use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\User;
-
 class ListUsersCommand extends AbstractCommand
 {
-    const RETURN_VAR_NOT_FOUND = 4;
+    public const RETURN_VAR_NOT_FOUND = 4;
 
     /**
      * @return \DOMDocument|null
@@ -23,11 +18,11 @@ public function execute()
 
         $result = $this->getShellCommandExecutor()->execute($shellCommand);
 
-        if ($result->getReturnVar() === 4) {
+        if (4 === $result->getReturnVar()) {
             return null;
         }
 
-        if ($result->getReturnVar() !== 0) {
+        if (0 !== $result->getReturnVar()) {
             throw new \RuntimeException(
                 'AqBanking exited with errors: ' . PHP_EOL
                 . implode(PHP_EOL, $result->getErrors())
diff --git a/src/Command/RenderContextFileToXMLCommand.php b/src/Command/RenderContextFileToXMLCommand.php
index 2372f8c..8765e24 100644
--- a/src/Command/RenderContextFileToXMLCommand.php
+++ b/src/Command/RenderContextFileToXMLCommand.php
@@ -7,7 +7,6 @@
 class RenderContextFileToXMLCommand extends AbstractCommand
 {
     /**
-     * @param ContextFile $contextFile
      * @return \DOMDocument
      * @throws \RuntimeException
      */
@@ -22,14 +21,14 @@ public function execute(ContextFile $contextFile, bool $returnSimpleXml = false)
 
         $result = $this->getShellCommandExecutor()->execute($shellCommand);
 
-        if ($result->getReturnVar() !== 0) {
+        if (0 !== $result->getReturnVar()) {
             throw new \RuntimeException(
                 'AqBanking exited with errors: ' . PHP_EOL
                 . implode(PHP_EOL, $result->getErrors())
             );
         }
 
-        if($returnSimpleXml) {
+        if ($returnSimpleXml) {
             return new \SimpleXMLElement(implode(PHP_EOL, $result->getOutput()));
         }
 
diff --git a/src/Command/RequestCommand.php b/src/Command/RequestCommand.php
index 5077b4c..cbd948c 100644
--- a/src/Command/RequestCommand.php
+++ b/src/Command/RequestCommand.php
@@ -25,11 +25,6 @@ class RequestCommand extends AbstractCommand
      */
     private $pinFile;
 
-    /**
-     * @param Account $account
-     * @param ContextFile $contextFile
-     * @param PinFile $pinFile
-     */
     public function __construct(Account $account, ContextFile $contextFile, PinFile $pinFile)
     {
         $this->account = $account;
@@ -38,7 +33,6 @@ public function __construct(Account $account, ContextFile $contextFile, PinFile
     }
 
     /**
-     * @param \DateTime $fromDate
      * @throws ShellCommandExecutor\DefectiveResultException
      */
     public function execute(\DateTime $fromDate = null)
@@ -59,7 +53,6 @@ public function execute(\DateTime $fromDate = null)
     }
 
     /**
-     * @param \DateTime $fromDate
      * @return string
      */
     private function getShellCommand(\DateTime $fromDate = null)
diff --git a/src/Command/SepaTransferCommand.php b/src/Command/SepaTransferCommand.php
index 5fe6c33..f93e5df 100644
--- a/src/Command/SepaTransferCommand.php
+++ b/src/Command/SepaTransferCommand.php
@@ -3,14 +3,13 @@
 namespace AqBanking\Command;
 
 use AqBanking\Account;
+use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
+use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
 use AqBanking\ContextFile;
 use AqBanking\PinFile\PinFile;
-use AqBanking\Command\AbstractCommand;
-use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
-use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
-
-class SepaTransferCommand extends AbstractCommand {
 
+class SepaTransferCommand extends AbstractCommand
+{
     /**
      * @var Account
      */
@@ -26,11 +25,6 @@ class SepaTransferCommand extends AbstractCommand {
      */
     private $pinFile;
 
-    /**
-     * @param Account $account
-     * @param ContextFile $contextFile
-     * @param PinFile $pinFile
-     */
     public function __construct(Account $account, ContextFile $contextFile, PinFile $pinFile)
     {
         $this->account = $account;
@@ -38,8 +32,6 @@ public function __construct(Account $account, ContextFile $contextFile, PinFile
         $this->pinFile = $pinFile;
     }
 
-
-
     /**
      * @param string $rname remote name
      * @param string $riban remote iban
@@ -82,7 +74,7 @@ private function getShellCommand(string $rname, string $riban, string $value, st
             . " --account=" . escapeshellcmd($this->account->getAccountNumber())
             . " --ctxfile=" . escapeshellcmd($this->contextFile->getPath())
             . " --rname='" . escapeshellcmd($rname) . "'"
-            . " --riban=" .  escapeshellcmd($riban)
+            . " --riban=" . escapeshellcmd($riban)
             . " --value=" . escapeshellcmd($value)
             . " --purpose='" . escapeshellcmd($purpose) . "'"
         ;
diff --git a/src/Command/SetAppropriateITanModeCommand.php b/src/Command/SetAppropriateITanModeCommand.php
index d6b1386..abb523e 100644
--- a/src/Command/SetAppropriateITanModeCommand.php
+++ b/src/Command/SetAppropriateITanModeCommand.php
@@ -40,7 +40,7 @@ private function determineHbciVersionToSet()
         $requiredHbciVersion = $this->user->getBank()->getHbciVersion();
         $highestVersionAvailable = $this->findHighestAvailableHbciVersion($result);
 
-        if (!$highestVersionAvailable) {
+        if (! $highestVersionAvailable) {
             throw new DefectiveResultException(
                 'AqBanking could not find any available HBCI version',
                 0,
@@ -63,7 +63,6 @@ private function determineHbciVersionToSet()
     }
 
     /**
-     * @param Result $result
      * @return null|HbciVersion
      */
     private function findHighestAvailableHbciVersion(Result $result)
@@ -71,9 +70,9 @@ private function findHighestAvailableHbciVersion(Result $result)
         $highestVersionAvailable = null;
 
         foreach ($result->getOutput() as $line) {
-            $matches = array();
+            $matches = [];
             $regex = '/^- (?P<code>\d+) \(.+\/(V(?P<version>\d+))\/.+\).*\[available( and selected)?\]$/';
-            if (!preg_match($regex, $line, $matches)) {
+            if (! preg_match($regex, $line, $matches)) {
                 continue;
             }
             $version = new HbciVersion($matches['version'], $matches['code']);
@@ -86,7 +85,6 @@ private function findHighestAvailableHbciVersion(Result $result)
     }
 
     /**
-     * @param HbciVersion $highestVersionAvailable
      * @throws DefectiveResultException
      */
     private function setHbciVersion(HbciVersion $highestVersionAvailable)
@@ -100,7 +98,7 @@ private function setHbciVersion(HbciVersion $highestVersionAvailable)
 
         $result = $this->getShellCommandExecutor()->execute($shellCommand);
 
-        if ($result->getReturnVar() !== 0 || count($result->getErrors()) > 0) {
+        if (0 !== $result->getReturnVar() || \count($result->getErrors()) > 0) {
             throw new DefectiveResultException(
                 'Unexpected result on setting the user\'s HBCI version',
                 0,
diff --git a/src/Command/SetITanModeCommand.php b/src/Command/SetITanModeCommand.php
index d1ba11b..b5e60ad 100644
--- a/src/Command/SetITanModeCommand.php
+++ b/src/Command/SetITanModeCommand.php
@@ -2,7 +2,6 @@
 
 namespace AqBanking\Command;
 
-use AqBanking\Command\AddUserCommand\UserAlreadyExistsException;
 use AqBanking\Command\ShellCommandExecutor\DefectiveResultException;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
 use AqBanking\ExistingUser;
diff --git a/src/Command/ShellCommandExecutor.php b/src/Command/ShellCommandExecutor.php
index 043ba00..01a528e 100644
--- a/src/Command/ShellCommandExecutor.php
+++ b/src/Command/ShellCommandExecutor.php
@@ -6,7 +6,7 @@
 
 class ShellCommandExecutor
 {
-    const ERROR_REPORTING = 'error';
+    public const ERROR_REPORTING = 'error';
 
     public function execute($shellCommand)
     {
@@ -14,12 +14,12 @@ public function execute($shellCommand)
             ' GWEN_LOGLEVEL=' . self::ERROR_REPORTING .
             ' AQHBCI_LOGLEVEL=' . self::ERROR_REPORTING .
             ' LANG=C ' . $shellCommand;
-        $output = array();
+        $output = [];
         $returnVar = null;
         $tempFile = tempnam(sys_get_temp_dir(), 'aqb-');
 
-//        FIXME: Make a configurable log file
-//        file_put_contents('/tmp/aqbanking.log', $shellCommand . PHP_EOL, FILE_APPEND);
+        //        FIXME: Make a configurable log file
+        //        file_put_contents('/tmp/aqbanking.log', $shellCommand . PHP_EOL, FILE_APPEND);
 
         exec($shellCommand . ' 2>' . $tempFile, $output, $returnVar);
 
diff --git a/src/Command/ShellCommandExecutor/DefectiveResultException.php b/src/Command/ShellCommandExecutor/DefectiveResultException.php
index 3cee403..f89b846 100644
--- a/src/Command/ShellCommandExecutor/DefectiveResultException.php
+++ b/src/Command/ShellCommandExecutor/DefectiveResultException.php
@@ -16,10 +16,13 @@ class DefectiveResultException extends \Exception
 
     public function __construct($message = '', $code = 0, \Exception $previous = null, Result $result = null, $shellCommand = '')
     {
-        parent::__construct($message .
+        parent::__construct(
+            $message .
             " - Command: " . $shellCommand .
             " - Errors: " . implode(PHP_EOL, $result->getErrors()),
-            $code, $previous);
+            $code,
+            $previous
+        );
 
         $this->result = $result;
         $this->shellCommand = $shellCommand;
diff --git a/src/Command/ShellCommandExecutor/Result.php b/src/Command/ShellCommandExecutor/Result.php
index 7952b0f..c76b741 100644
--- a/src/Command/ShellCommandExecutor/Result.php
+++ b/src/Command/ShellCommandExecutor/Result.php
@@ -20,8 +20,6 @@ class Result
     private $returnVar;
 
     /**
-     * @param array $output
-     * @param array $errors
      * @param int $returnVar
      */
     public function __construct(array $output, array $errors, $returnVar)
diff --git a/src/Command/ShellCommandExecutor/ResultAnalyzer.php b/src/Command/ShellCommandExecutor/ResultAnalyzer.php
index 6c763cf..9ace097 100644
--- a/src/Command/ShellCommandExecutor/ResultAnalyzer.php
+++ b/src/Command/ShellCommandExecutor/ResultAnalyzer.php
@@ -4,7 +4,7 @@
 
 class ResultAnalyzer
 {
-    private $expectedOutputRegexes = array(
+    private $expectedOutputRegexes = [
         '/Automatically accepting valid new certificate/',
         '/Automatically accepting certificate/',
         '/The TLS connection was non-properly terminated./', // it usually automatically restarts, so no error
@@ -38,16 +38,15 @@ class ResultAnalyzer
         '/There is no old settings folder, need initial setup/',
         '/Account is new, adding/',
         '/^  .*$/', // everything starting with a space belongs to a previous message and is not an error (hopefully)
-        '/Selecting PAIN format.*$/'
-    );
+        '/Selecting PAIN format.*$/',
+    ];
 
     /**
-     * @param Result $result
      * @return bool
      */
     public function isDefectiveResult(Result $result)
     {
-        if ($result->getReturnVar() !== 0) {
+        if (0 !== $result->getReturnVar()) {
             return true;
         }
         if ($error = $this->resultHasErrors($result)) {
@@ -58,7 +57,7 @@ public function isDefectiveResult(Result $result)
 
     private function resultHasErrors(Result $result)
     {
-        if (count($result->getErrors()) == 1 && preg_match('/accepting valid new certificate/', $result->getErrors()[0])) {
+        if (1 === \count($result->getErrors()) && preg_match('/accepting valid new certificate/', $result->getErrors()[0])) {
             // When calling getsysid with wrong PIN, we don't get any error message.
             // The only significant aspect of the error is that the output is just one line with
             // "accepting valid new certificate"
diff --git a/src/ContentXmlRenderer/MoneyElementRenderer.php b/src/ContentXmlRenderer/MoneyElementRenderer.php
index d2e932a..cb92939 100644
--- a/src/ContentXmlRenderer/MoneyElementRenderer.php
+++ b/src/ContentXmlRenderer/MoneyElementRenderer.php
@@ -17,12 +17,12 @@ class MoneyElementRenderer
      */
     public function render($value, $currencyString)
     {
-        if ($currencyString == '') {
+        if ('' === $currencyString) {
             $currencyString = 'EUR';
         }
         $currency = new Currency($currencyString);
 
-        if (false === (new ISOCurrencies())->contains($currency)){
+        if (false === (new ISOCurrencies())->contains($currency)) {
             throw new RuntimeException("Unknown currency input '$currencyString'");
         }
 
@@ -32,16 +32,20 @@ public function render($value, $currencyString)
     /**
      * @see https://github.com/janunger/aqbanking-php/issues/1
      *
+     * @FIXME You can't rely on floating point numbers. Use bcmath instead.
+     *        see https://0.30000000000000004.com/
+     *        php -r "var_dump(.1 + .2);" // float(0.30000000000000004)
+     *
      * @param string $value
      * @throws \AqBanking\RuntimeException
      * @return int
      */
     private function normalizeAmount($value)
     {
-        list ($amount, $divisor) = $this->extractAmountAndDivisorAsString($value);
+        list($amount, $divisor) = $this->extractAmountAndDivisorAsString($value);
 
-        $multiplier = 100/(int)$divisor;
-        $normalizedAmount = (int)$amount * $multiplier;
+        $multiplier = 100 / (int) $divisor;
+        $normalizedAmount = (int) $amount * $multiplier;
 
         if ($this->isNormalizedValueBiassed($normalizedAmount)) {
             throw new RuntimeException(
@@ -49,29 +53,28 @@ private function normalizeAmount($value)
             );
         }
 
-        return (int)$normalizedAmount;
+        return (int) $normalizedAmount;
     }
 
     /**
-     * @param $amountString
      * @return array
      * @throws \AqBanking\RuntimeException
      */
     private function extractAmountAndDivisorAsString($amountString)
     {
-        $matches = array();
+        $matches = [];
         if (preg_match('/^(?P<amount>(-){0,1}\d+)\/(?P<divisor>1(0)*)$/', $amountString, $matches)) {
             $amount = $matches['amount'];
             $divisor = $matches['divisor'];
 
-            return array($amount, $divisor);
+            return [$amount, $divisor];
         }
 
-        $matches = array();
+        $matches = [];
         if (preg_match('/^(?P<amount>(-){0,1}\d+)$/', $amountString, $matches)) {
             $amount = $matches['amount'];
 
-            return array($amount, '1');
+            return [$amount, '1'];
         }
 
         throw new RuntimeException("Unexpected amount input '$amountString'");
@@ -83,6 +86,6 @@ private function extractAmountAndDivisorAsString($amountString)
      */
     private function isNormalizedValueBiassed($normalizedAmount)
     {
-        return $normalizedAmount != (int)$normalizedAmount;
+        return 0.00 !== fmod($normalizedAmount, 1);
     }
 }
diff --git a/src/ContextXmlRenderer.php b/src/ContextXmlRenderer.php
index 1072df8..a38ac7d 100644
--- a/src/ContextXmlRenderer.php
+++ b/src/ContextXmlRenderer.php
@@ -3,7 +3,6 @@
 namespace AqBanking;
 
 use AqBanking\ContentXmlRenderer\MoneyElementRenderer;
-use Money\Currency;
 use Money\Money;
 
 class ContextXmlRenderer
@@ -36,7 +35,7 @@ public function __construct(\DOMDocument $domDocument)
     public function getTransactions()
     {
         $transactionNodes = $this->domDocument->getElementsByTagName('transaction');
-        $transactions = array();
+        $transactions = [];
 
         foreach ($transactionNodes as $transactionNode) {
             $localBankCode = $this->renderMultiLineElement(
@@ -96,7 +95,7 @@ public function getTransactions()
     public function getBalances()
     {
         $balanceNodes = $this->domDocument->getElementsByTagName('balance');
-        $balances = array();
+        $balances = [];
 
         /**
          * @var DOMElement $balanceNode
@@ -113,13 +112,12 @@ public function getBalances()
     }
 
     /**
-     * @param \DOMNodeList $nodes
      * @throws \RuntimeException
      * @return string
      */
     private function renderMultiLineElement(\DOMNodeList $nodes)
     {
-        $lines = array();
+        $lines = [];
         foreach ($nodes as $node) {
             $line = trim($node->nodeValue);
             if (false !== strpos($line, '|')) {
@@ -132,14 +130,12 @@ private function renderMultiLineElement(\DOMNodeList $nodes)
     }
 
     /**
-     * @param \DOMNode $node
-     * @param \DOMNode $node
      * @throws \RuntimeException
      * @return \DateTime
      */
     private function renderDateElement(\DOMNode $node = null)
     {
-        if(!$node) {
+        if (! $node) {
             return null;
         }
 
@@ -154,7 +150,6 @@ private function renderDateElement(\DOMNode $node = null)
     }
 
     /**
-     * @param \DOMNode $node
      * @return Money
      * @throws \Exception
      */
@@ -168,7 +163,6 @@ private function renderMoneyElement(\DOMNode $node)
     }
 
     /**
-     * @param \DOMNodeList $valueNodes
      * @return string
      */
     private function renderSimpleTextElement(\DOMNodeList $valueNodes)
diff --git a/src/ExistingAccount.php b/src/ExistingAccount.php
index 3be26e5..a042728 100644
--- a/src/ExistingAccount.php
+++ b/src/ExistingAccount.php
@@ -19,13 +19,9 @@ class ExistingAccount
      */
     private $uniqueAccountId;
 
-    /**
-     * @param Account $account
-     * @param int $uniqueAccountId
-     */
     public function __construct(Account $account, int $uniqueAccountId)
     {
-        $this->user= $account;
+        $this->user = $account;
         $this->uniqueAccountId = $uniqueAccountId;
     }
 
diff --git a/src/ExistingUser.php b/src/ExistingUser.php
index a424dc9..39ded3a 100644
--- a/src/ExistingUser.php
+++ b/src/ExistingUser.php
@@ -19,14 +19,9 @@ class ExistingUser
      */
     private $uniqueUserId;
 
-    /**
-     * @param string $userId
-     * @param string $userName
-     * @param Bank $bank
-     */
     public function __construct(User $user, int $uniqueUserId)
     {
-        $this->user= $user;
+        $this->user = $user;
         $this->uniqueUserId = $uniqueUserId;
     }
 
diff --git a/src/HbciVersion.php b/src/HbciVersion.php
index a1346dc..73b614a 100644
--- a/src/HbciVersion.php
+++ b/src/HbciVersion.php
@@ -25,7 +25,6 @@ public function __construct($versionNumber, $methodCode = null)
     }
 
     /**
-     * @param HbciVersion $hbciVersion
      * @return bool
      */
     public function isHigherThan(HbciVersion $hbciVersion = null)
diff --git a/src/PinFile/PinFileCreator.php b/src/PinFile/PinFileCreator.php
index 9daddef..c86a731 100644
--- a/src/PinFile/PinFileCreator.php
+++ b/src/PinFile/PinFileCreator.php
@@ -18,7 +18,6 @@ public function __construct($pinFileDir)
 
     /**
      * @param string $pin
-     * @param User $user
      * @return PinFileInterface
      */
     public function createFile($pin, User $user)
@@ -46,10 +45,10 @@ public function createFile($pin, User $user)
      */
     private function assertIsWritableDir($pinFileDir)
     {
-        if (!is_dir($pinFileDir)) {
+        if (! is_dir($pinFileDir)) {
             throw new \InvalidArgumentException("PIN file dir '$pinFileDir' is not a directory");
         }
-        if (!is_writable($pinFileDir)) {
+        if (! is_writable($pinFileDir)) {
             throw new \InvalidArgumentException("PIN file dir '$pinFileDir' is not writable");
         }
     }
@@ -63,8 +62,7 @@ private function assertIsWritableDir($pinFileDir)
     private function createFileContent($pin, $userId, $bankCodeString)
     {
         // The comments and line breaks seem to be mandatory for AqBanking to parse the file
-        return
-            '# This is a PIN file to be used with AqBanking' . PHP_EOL
+        return '# This is a PIN file to be used with AqBanking' . PHP_EOL
             . '# Please insert the PINs/passwords for the users below' . PHP_EOL
             . PHP_EOL
             . '# User "' . $userId . '" at "' . $bankCodeString . '"' . PHP_EOL
diff --git a/src/RuntimeException.php b/src/RuntimeException.php
index f1f476c..1141a25 100644
--- a/src/RuntimeException.php
+++ b/src/RuntimeException.php
@@ -3,4 +3,5 @@
 namespace AqBanking;
 
 class RuntimeException extends \RuntimeException
-{}
+{
+}
diff --git a/src/Transaction.php b/src/Transaction.php
index 0c23943..bfb5ec3 100644
--- a/src/Transaction.php
+++ b/src/Transaction.php
@@ -156,11 +156,11 @@ public function toArray()
             'value' => [
                 'amount' => $this->getValue()->getAmount(),
                 'currency' => $this->getValue()->getCurrency()->getName(),
-                'priceUnit' => 100
+                'priceUnit' => 100,
             ],
             'valutaDate' => $this->getValutaDate() ? $this->getValutaDate()->format('Y-m-d') : null,
             'primaNota' => $this->getPrimaNota(),
-            'customerReference' => $this->getCustomerReference()
+            'customerReference' => $this->getCustomerReference(),
         ];
     }
 }
diff --git a/src/User.php b/src/User.php
index 5057afd..c664683 100644
--- a/src/User.php
+++ b/src/User.php
@@ -22,7 +22,6 @@ class User
     /**
      * @param string $userId
      * @param string $userName
-     * @param Bank $bank
      */
     public function __construct($userId, $userName, Bank $bank)
     {
diff --git a/src/UserMatcher.php b/src/UserMatcher.php
index c4f9e51..d4d0d65 100644
--- a/src/UserMatcher.php
+++ b/src/UserMatcher.php
@@ -16,14 +16,14 @@ class UserMatcher
     public function __construct(\DOMDocument $domDocument = null)
     {
         $this->domDocument = $domDocument;
-        if ($domDocument !== null) {
+        if (null !== $domDocument) {
             $this->xPath = new \DOMXPath($domDocument);
         }
     }
 
     public function getExistingUser(User $user)
     {
-        if ($this->domDocument === null) {
+        if (null === $this->domDocument) {
             return null;
         }
 
@@ -37,9 +37,9 @@ public function getExistingUser(User $user)
             $uniqueId = $userNode->getElementsByTagName('userUniqueId')[0]->nodeValue;
 
             if (
-                $user->getUserName() == $userName &&
-                $user->getUserId() == $userId &&
-                $user->getBank()->getBankCode()->getString() == $bankCode
+                $user->getUserName() === $userName &&
+                $user->getUserId() === $userId &&
+                $user->getBank()->getBankCode()->getString() === $bankCode
             ) {
                 return new ExistingUser($user, $uniqueId);
             }
@@ -48,4 +48,3 @@ public function getExistingUser(User $user)
         return null;
     }
 }
-
diff --git a/tests/Command/AddUserCommandTest.php b/tests/Command/AddUserCommandTest.php
index 820e00c..8f908c6 100644
--- a/tests/Command/AddUserCommandTest.php
+++ b/tests/Command/AddUserCommandTest.php
@@ -3,10 +3,10 @@
 namespace Tests\Command;
 
 use AqBanking\Bank;
-use AqBanking\User;
 use AqBanking\BankCode;
 use AqBanking\Command\AddUserCommand;
 use AqBanking\Command\ShellCommandExecutor\Result;
+use AqBanking\User;
 
 class AddUserCommandTest extends ShellCommandTestCase
 {
@@ -36,7 +36,7 @@ public function testCanAddAqBankingUser()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
 
         $sut = new AddUserCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -69,7 +69,7 @@ public function testThrowsExceptionIfUserAlreadyExists()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), AddUserCommand::RETURN_VAR_USER_ALREADY_EXISTS));
+            ->andReturn(new Result([], [], AddUserCommand::RETURN_VAR_USER_ALREADY_EXISTS));
 
         $sut = new AddUserCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -100,7 +100,7 @@ public function testThrowsExceptionOnUnexpectedResult()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 127));
+            ->andReturn(new Result([], [], 127));
 
         $sut = new AddUserCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
diff --git a/tests/Command/CheckAqBankingCommandTest.php b/tests/Command/CheckAqBankingCommandTest.php
index 10ba300..f43b4f7 100644
--- a/tests/Command/CheckAqBankingCommandTest.php
+++ b/tests/Command/CheckAqBankingCommandTest.php
@@ -2,9 +2,9 @@
 
 namespace Tests\Command;
 
-use PHPUnit\Framework\TestCase;
 use AqBanking\Command\CheckAqBankingCommand;
 use AqBanking\Command\ShellCommandExecutor\Result;
+use PHPUnit\Framework\TestCase;
 
 class CheckAqBankingCommandTest extends TestCase
 {
@@ -14,11 +14,11 @@ public function testCanTellIfAqBankingIsInstalled()
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-cli --help')
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-config --vstring')
-            ->andReturn(new Result(array('5.0.24'), array(), 0));
+            ->andReturn(new Result(['5.0.24'], [], 0));
 
         $sut = new CheckAqBankingCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -34,7 +34,7 @@ public function testCanTellIfAqBankingIsNotInstalled()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with('aqbanking-cli --help')
-            ->andReturn(new Result(array(), array(), 127));
+            ->andReturn(new Result([], [], 127));
 
         $sut = new CheckAqBankingCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -48,11 +48,11 @@ public function testCanHandleVeryOldAqBankingVersionWithoutAqBankingConfig()
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-cli --help')
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-config --vstring')
-            ->andReturn(new Result(array(), array(), 127));
+            ->andReturn(new Result([], [], 127));
 
         $sut = new CheckAqBankingCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -66,11 +66,11 @@ public function testCanTellIfAqBankingVersionIsTooOld()
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-cli --help')
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
         $shellCommandExecutorMock
             ->shouldReceive('execute')
             ->with('aqbanking-config --vstring')
-            ->andReturn(new Result(array('5.0.23'), array(), 0));
+            ->andReturn(new Result(['5.0.23'], [], 0));
 
         $sut = new CheckAqBankingCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
diff --git a/tests/Command/GetSysIDCommandTest.php b/tests/Command/GetSysIDCommandTest.php
index c418205..b6967a2 100644
--- a/tests/Command/GetSysIDCommandTest.php
+++ b/tests/Command/GetSysIDCommandTest.php
@@ -3,12 +3,12 @@
 namespace Tests\Command;
 
 use AqBanking\Bank;
-use AqBanking\User;
 use AqBanking\BankCode;
-use AqBanking\ExistingUser;
-use AqBanking\PinFile\PinFile;
 use AqBanking\Command\GetSysIDCommand;
 use AqBanking\Command\ShellCommandExecutor\Result;
+use AqBanking\ExistingUser;
+use AqBanking\PinFile\PinFile;
+use AqBanking\User;
 
 class GetSysIDCommandTest extends ShellCommandTestCase
 {
@@ -40,7 +40,7 @@ public function testPollsSysID()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
 
         $sut = new GetSysIDCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -79,7 +79,7 @@ public function testThrowsExceptionOnUnexpectedResult()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 1));
+            ->andReturn(new Result([], [], 1));
 
         $sut = new GetSysIDCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
diff --git a/tests/Command/RenderContextFileToXMLCommandTest.php b/tests/Command/RenderContextFileToXMLCommandTest.php
index db0226c..2dc16f8 100644
--- a/tests/Command/RenderContextFileToXMLCommandTest.php
+++ b/tests/Command/RenderContextFileToXMLCommandTest.php
@@ -2,10 +2,10 @@
 
 namespace Tests\Command;
 
+use AqBanking\Command\RenderContextFileToXMLCommand;
+use AqBanking\Command\ShellCommandExecutor\Result;
 use AqBanking\ContextFile;
 use PHPUnit\Framework\TestCase;
-use AqBanking\Command\ShellCommandExecutor\Result;
-use AqBanking\Command\RenderContextFileToXMLCommand;
 
 class RenderContextFileToXMLCommandTest extends TestCase
 {
@@ -21,25 +21,23 @@ public function testCanIssueCorrectRenderCommand()
             . ' export'
             . ' --ctxfile=' . $contextFile->getPath()
             . ' --exporter=xmldb';
-        $output = array(
+        $output = [
             '<?xml version="1.0" encoding="utf-8"?>',
             '<ImExporterContext type="group">',
-            '</ImExporterContext>'
-        );
+            '</ImExporterContext>',
+        ];
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result($output, array(), 0));
+            ->andReturn(new Result($output, [], 0));
 
         $expectedXmlString = implode(PHP_EOL, $output);
 
-
         $sut = new RenderContextFileToXMLCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
 
         $result = $sut->execute($contextFile);
 
-
         $this->assertInstanceOf('DOMDocument', $result);
         $this->assertXmlStringEqualsXmlString($expectedXmlString, $result->saveXML());
     }
@@ -49,7 +47,7 @@ public function testCanHandleUnexpectedOutput()
         $shellCommandExecutorMock = \Mockery::mock('AqBanking\Command\ShellCommandExecutor');
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
-            ->andReturn(new Result(array(), array(), 1));
+            ->andReturn(new Result([], [], 1));
 
         $sut = new RenderContextFileToXMLCommand();
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -72,7 +70,8 @@ public function testCanRenderSimpleXML()
                     [file_get_contents('./tests/fixtures/test_context_file_transactions_with_type_transfer.xml')],
                     [],
                     0
-            ));
+                )
+            );
 
         $simpleXML = $sut->execute(
             new ContextFile('/path/to/some/context/file.ctx'),
@@ -81,62 +80,62 @@ public function testCanRenderSimpleXML()
 
         $this->assertEquals(
             'DE33123456780000000000',
-            (string)$simpleXML->accountInfoList->accountInfo->iban->value
+            (string) $simpleXML->accountInfoList->accountInfo->iban->value
         );
 
         $this->assertEquals(
             'ASDFFFWWAA',
-            (string)$simpleXML->accountInfoList->accountInfo->bic->value
+            (string) $simpleXML->accountInfoList->accountInfo->bic->value
         );
 
         $this->assertEquals(
             'HARALD MUSTERMANN',
-            (string)$simpleXML->accountInfoList->accountInfo->owner->value
+            (string) $simpleXML->accountInfoList->accountInfo->owner->value
         );
 
         $this->assertEquals(
             'DE15453384569356645534',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->remoteIban->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->remoteIban->value
         );
 
         $this->assertEquals(
             'WARENHAUS GMBH',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->remoteName->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->remoteName->value
         );
 
         $this->assertEquals(
             '2174/100:EUR',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->value->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->value->value
         );
 
         $this->assertEquals(
             '0',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->executionDay->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->executionDay->value
         );
 
         $this->assertEquals(
             '20220106',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->date->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->date->value
         );
 
         $this->assertEquals(
             'Rechnung',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->purpose->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->purpose->value
         );
 
         $this->assertEquals(
             'transfer',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->type->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->type->value
         );
 
         $this->assertEquals(
             'pending',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->status->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->status->value
         );
 
         $this->assertEquals(
             '2407',
-            (string)$simpleXML->accountInfoList->accountInfo->transactionList->transaction->uniqueId->value
+            (string) $simpleXML->accountInfoList->accountInfo->transactionList->transaction->uniqueId->value
         );
     }
 }
diff --git a/tests/Command/RequestCommandTest.php b/tests/Command/RequestCommandTest.php
index 54fcb32..8e0b38f 100644
--- a/tests/Command/RequestCommandTest.php
+++ b/tests/Command/RequestCommandTest.php
@@ -4,9 +4,9 @@
 
 use AqBanking\Account;
 use AqBanking\BankCode;
-use AqBanking\ContextFile;
 use AqBanking\Command\RequestCommand;
 use AqBanking\Command\ShellCommandExecutor\Result;
+use AqBanking\ContextFile;
 
 class RequestCommandTest extends ShellCommandTestCase
 {
@@ -39,7 +39,7 @@ public function testCanExecute()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
 
         $sut = new RequestCommand($account, $contextFile, $pinFileMock);
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -81,7 +81,7 @@ public function testCanExecuteWithFromDate()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
 
         $sut = new RequestCommand($account, $contextFile, $pinFileMock);
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -107,7 +107,7 @@ public function testThrowsExceptionOnUnexpectedResult()
         $shellCommandExecutorMock = $this->getShellCommandExecutorMock();
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
-            ->andReturn(new Result(array(), array('some unexpected output'), 0));
+            ->andReturn(new Result([], ['some unexpected output'], 0));
 
         $sut = new RequestCommand($account, $contextFile, $pinFileMock);
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
diff --git a/tests/Command/SepaTransferCommandTest.php b/tests/Command/SepaTransferCommandTest.php
index e9e480b..f15ca84 100644
--- a/tests/Command/SepaTransferCommandTest.php
+++ b/tests/Command/SepaTransferCommandTest.php
@@ -4,10 +4,9 @@
 
 use AqBanking\Account;
 use AqBanking\BankCode;
-use AqBanking\ContextFile;
 use AqBanking\Command\SepaTransferCommand;
-use Tests\Command\ShellCommandTestCase;
 use AqBanking\Command\ShellCommandExecutor\Result;
+use AqBanking\ContextFile;
 
 class SepaTransferCommandTest extends ShellCommandTestCase
 {
@@ -48,7 +47,7 @@ public function testCanExecute()
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
             ->with($expectedCommand)
-            ->andReturn(new Result(array(), array(), 0));
+            ->andReturn(new Result([], [], 0));
 
         $sut = new SepaTransferCommand($account, $contextFile, $pinFileMock);
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
@@ -59,10 +58,10 @@ public function testCanExecute()
             $purpose
         );
         $this->assertTrue(true);
-
     }
 
-    public function testAcceptsValidOutput() {
+    public function testAcceptsValidOutput()
+    {
         $accountNumber = '12345678';
         $bankCodeString = '23456789';
         $bankCode = new BankCode($bankCodeString);
@@ -77,17 +76,15 @@ public function testAcceptsValidOutput() {
         $shellCommandExecutorMock = $this->getShellCommandExecutorMock();
         $shellCommandExecutorMock
             ->shouldReceive('execute')->once()
-            ->andReturn(new Result(array(), array('3:2022/01/06 05-26-00:aqhbci(42):jobtransferbase.c: 1036: Selecting PAIN format [urn:iso:std:iso:20022:tech:xsd:pain.001.001.03]'), 0));
+            ->andReturn(new Result([], ['3:2022/01/06 05-26-00:aqhbci(42):jobtransferbase.c: 1036: Selecting PAIN format [urn:iso:std:iso:20022:tech:xsd:pain.001.001.03]'], 0));
 
         $sut = new SepaTransferCommand($account, $contextFile, $pinFileMock);
         $sut->setShellCommandExecutor($shellCommandExecutorMock);
 
         // No exception has been thrown for a valid error output by aqbanking
         $this->assertTrue(true);
-
     }
 
-
     /**
      * @param string $pathToPinFile
      * @return \Mockery\MockInterface
@@ -101,4 +98,4 @@ private function getPinFileMock($pathToPinFile)
 
         return $pinFileMock;
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Command/ShellCommandExecutor/ResultAnalyzerTest.php b/tests/Command/ShellCommandExecutor/ResultAnalyzerTest.php
index 5adeadb..c1c0ab4 100644
--- a/tests/Command/ShellCommandExecutor/ResultAnalyzerTest.php
+++ b/tests/Command/ShellCommandExecutor/ResultAnalyzerTest.php
@@ -2,15 +2,15 @@
 
 namespace Tests\Command\ShellCommandExecutor;
 
-use PHPUnit\Framework\TestCase;
 use AqBanking\Command\ShellCommandExecutor\Result;
 use AqBanking\Command\ShellCommandExecutor\ResultAnalyzer;
+use PHPUnit\Framework\TestCase;
 
 class ResultAnalyzerTest extends TestCase
 {
     public function testEmptyResultIsNoError()
     {
-        $result = new Result(array(), array(), 0);
+        $result = new Result([], [], 0);
 
         $sut = new ResultAnalyzer();
 
@@ -19,7 +19,7 @@ public function testEmptyResultIsNoError()
 
     public function testRecognizesErrorByResultVar()
     {
-        $result = new Result(array(), array(), 1);
+        $result = new Result([], [], 1);
 
         $sut = new ResultAnalyzer();
 
@@ -28,15 +28,15 @@ public function testRecognizesErrorByResultVar()
 
     public function testCanTellCorrectPollResult()
     {
-        $errors = array(
+        $errors = [
             '5:2013/07/22 11-32-32:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
             '5:2013/07/22 11-32-33:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
             '5:2013/07/22 11-32-33:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
             '5:2013/07/22 11-32-33:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
             '5:2013/07/22 11-32-34:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
-            '5:2013/07/22 11-32-34:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]'
-        );
-        $result = new Result(array(), $errors, 0);
+            '5:2013/07/22 11-32-34:aqbanking(39873):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
+        ];
+        $result = new Result([], $errors, 0);
 
         $sut = new ResultAnalyzer();
 
@@ -45,13 +45,13 @@ public function testCanTellCorrectPollResult()
 
     public function testCanTellDefectivePollResult()
     {
-        $errors = array(
+        $errors = [
             '5:2013/07/22 11-31-44:aqbanking(39859):abgui.c:  182: Automatically accepting valid new certificate [40:BD:81:8B:76:27:1A:58:5C:B7:68:46:1E:CB:F2:FD]',
             '3:2013/07/22 11-31-44:aqhbci(39859):outbox.c: 1390: Error performing queue (-2)',
             '5:2013/07/22 11-31-44:aqbanking(39859):./banking_online.c:  119: Error executing backend\'s queue',
-            '4:2013/07/22 11-31-44:aqbanking(39859):./banking_online.c:  137: Not a single job successfully executed'
-        );
-        $result = new Result(array(), $errors, 0);
+            '4:2013/07/22 11-31-44:aqbanking(39859):./banking_online.c:  137: Not a single job successfully executed',
+        ];
+        $result = new Result([], $errors, 0);
 
         $sut = new ResultAnalyzer();
 
diff --git a/tests/Command/ShellCommandExecutorTest.php b/tests/Command/ShellCommandExecutorTest.php
index 0705380..104bd1d 100644
--- a/tests/Command/ShellCommandExecutorTest.php
+++ b/tests/Command/ShellCommandExecutorTest.php
@@ -2,8 +2,8 @@
 
 namespace Tests\Command;
 
-use PHPUnit\Framework\TestCase;
 use AqBanking\Command\ShellCommandExecutor;
+use PHPUnit\Framework\TestCase;
 
 class ShellCommandExecutorTest extends TestCase
 {
@@ -13,8 +13,8 @@ public function testCanExecuteCommand()
 
         $result = $sut->execute('echo "whatever"');
 
-        $this->assertEquals(array("whatever"), $result->getOutput());
-        $this->assertEquals(array(), $result->getErrors());
+        $this->assertEquals(["whatever"], $result->getOutput());
+        $this->assertEquals([], $result->getErrors());
         $this->assertEquals(0, $result->getReturnVar());
     }
 
@@ -24,8 +24,8 @@ public function testCanTellAboutErrors()
 
         $result = $sut->execute("any-unknown-command");
 
-        $this->assertEquals(array(), $result->getOutput());
-        $this->assertNotEquals(0, count($result->getErrors()));
+        $this->assertEquals([], $result->getOutput());
+        $this->assertNotEquals(0, \count($result->getErrors()));
         $this->assertNotEquals(0, $result->getReturnVar());
     }
 }
diff --git a/tests/ContentXmlRenderer/MoneyElementRendererTest.php b/tests/ContentXmlRenderer/MoneyElementRendererTest.php
index 47d521b..6564d9c 100644
--- a/tests/ContentXmlRenderer/MoneyElementRendererTest.php
+++ b/tests/ContentXmlRenderer/MoneyElementRendererTest.php
@@ -2,9 +2,9 @@
 
 namespace Tests\ContentXmlRenderer;
 
+use AqBanking\ContentXmlRenderer\MoneyElementRenderer;
 use Money\Money;
 use PHPUnit\Framework\TestCase;
-use AqBanking\ContentXmlRenderer\MoneyElementRenderer;
 
 class MoneyElementRendererTest extends TestCase
 {
diff --git a/tests/ContextXmlRendererTest.php b/tests/ContextXmlRendererTest.php
index 7b15186..4ff171f 100644
--- a/tests/ContextXmlRendererTest.php
+++ b/tests/ContextXmlRendererTest.php
@@ -2,12 +2,12 @@
 
 namespace Tests;
 
-use Money\Money;
 use AqBanking\Account;
 use AqBanking\BankCode;
+use AqBanking\ContextXmlRenderer;
 use AqBanking\Transaction;
+use Money\Money;
 use PHPUnit\Framework\TestCase;
-use AqBanking\ContextXmlRenderer;
 
 class ContextXmlRendererTest extends TestCase
 {
@@ -25,7 +25,7 @@ public function can_render_transfers()
         $sut = new ContextXmlRenderer($domDocument);
 
         $localAccount = new Account(new BankCode('12345678'), '404072100', 'HARALD MUSTERMANN');
-        $expectedTransactions = array(
+        $expectedTransactions = [
             new Transaction(
                 $localAccount,
                 new Account(new BankCode(''), '', "WARENHAUS GMBH"),
@@ -36,7 +36,7 @@ public function can_render_transfers()
                 Money::EUR(2174),
                 '',
                 ''
-            ));
+            )];
 
         $this->assertEquals($expectedTransactions, $sut->getTransactions());
     }
@@ -55,7 +55,7 @@ public function can_render_transactions()
         $sut = new ContextXmlRenderer($domDocument);
 
         $localAccount = new Account(new BankCode('32151229'), '12112345');
-        $expectedTransactions = array(
+        $expectedTransactions = [
             new Transaction(
                 $localAccount,
                 new Account(new BankCode('MALADE51KOB'), 'DE62570501200000012345', 'Sehr sehr langer Kontoinhab'),
@@ -66,10 +66,9 @@ public function can_render_transactions()
                 Money::EUR(-1111),
                 '97186',
                 'KREW+'
-            ));
+            )];
 
         $this->assertEquals($expectedTransactions, $sut->getTransactions());
-
     }
 
     /**
diff --git a/tests/PinFileCreatorTest.php b/tests/PinFileCreatorTest.php
index d97205f..fc5a321 100644
--- a/tests/PinFileCreatorTest.php
+++ b/tests/PinFileCreatorTest.php
@@ -3,11 +3,11 @@
 namespace Tests;
 
 use AqBanking\Bank;
-use AqBanking\User;
 use AqBanking\BankCode;
+use AqBanking\PinFile\PinFileCreator;
+use AqBanking\User;
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
-use AqBanking\PinFile\PinFileCreator;
 
 class PinFileCreatorTest extends TestCase
 {
diff --git a/tests/TransactionTest.php b/tests/TransactionTest.php
index ac800dc..491ae0b 100644
--- a/tests/TransactionTest.php
+++ b/tests/TransactionTest.php
@@ -2,11 +2,11 @@
 
 namespace Tests;
 
-use Money\Money;
-use Money\Currency;
 use AqBanking\Account;
 use AqBanking\BankCode;
 use AqBanking\Transaction;
+use Money\Currency;
+use Money\Money;
 use PHPUnit\Framework\TestCase;
 
 class TransactionTest extends TestCase