diff --git a/README.md b/README.md
index 8e518b2..4bdb703 100644
--- a/README.md
+++ b/README.md
@@ -66,3 +66,15 @@ class ProviderNameExtendSocialite
 ## Overriding a Built-in Provider
 
 You can easily override a built-in `laravel/socialite` provider by creating a new one with exactly the same name (i.e. 'facebook').
+
+
+## Dynamically Passing a Config
+
+You can dynamically pass a config by using:
+```
+$key = 'SocialiteProviders.config.<provider_name>';
+$config = new \SocialiteProviders\Manager\Config('key', 'secret', 'callbackUri');
+$this->app->instance($key, $config)
+```
+
+**You must call this before you run any Socialite methods.**
diff --git a/src/Config.php b/src/Config.php
index 9b0bd2a..850210d 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -10,13 +10,13 @@ class Config implements Contracts\Config
 
     public function __construct($key, $secret, $callbackUri)
     {
-         $this->config = [
-             'client_id' => $key,
-             'client_secret' => $secret,
-             'redirect' => $callbackUri
-         ];
+        $this->config = [
+            'client_id'     => $key,
+            'client_secret' => $secret,
+            'redirect'      => $callbackUri,
+        ];
     }
-    
+
     /**
      * @return array
      */
diff --git a/src/SocialiteWasCalled.php b/src/SocialiteWasCalled.php
index da73b21..fedac5f 100644
--- a/src/SocialiteWasCalled.php
+++ b/src/SocialiteWasCalled.php
@@ -4,6 +4,7 @@
 
 use Illuminate\Contracts\Foundation\Application as LaravelApp;
 use Laravel\Socialite\SocialiteManager;
+use SocialiteProviders\Manager\Contracts;
 
 class SocialiteWasCalled
 {
@@ -23,7 +24,8 @@ public function __construct(LaravelApp $app)
     /**
      * @param string $providerName  'meetup'
      * @param string $providerClass 'Your\Name\Space\ClassNameProvider' must extend
-     *                              either Laravel\Socialite\Two\AbstractProvider or Laravel\Socialite\One\AbstractProvider
+     *                              either Laravel\Socialite\Two\AbstractProvider or
+     *                              Laravel\Socialite\One\AbstractProvider
      * @param string $oauth1Server  'Your\Name\Space\ClassNameServer' must extend League\OAuth1\Client\Server\Server
      *
      * @throws InvalidArgumentException
@@ -31,7 +33,7 @@ public function __construct(LaravelApp $app)
     public function extendSocialite($providerName, $providerClass, $oauth1Server = null)
     {
         /** @var SocialiteManager $socialite */
-        $socialite = $this->app->make('Laravel\Socialite\Contracts\Factory');
+        $socialite = $this->app->make(\Laravel\Socialite\Contracts\Factory::class);
         $provider = $this->buildProvider($socialite, $providerName, $providerClass, $oauth1Server);
         $socialite->extend(
             $providerName,
@@ -43,9 +45,9 @@ function () use ($provider) {
 
     /**
      * @param SocialiteManager $socialite
-     * @param $providerName
-     * @param string      $providerClass
-     * @param null|string $oauth1Server
+     * @param                  $providerName
+     * @param string           $providerClass
+     * @param null|string      $oauth1Server
      *
      * @return \Laravel\Socialite\One\AbstractProvider|\Laravel\Socialite\Two\AbstractProvider
      */
@@ -70,8 +72,8 @@ protected function buildProvider(SocialiteManager $socialite, $providerName, $pr
      */
     protected function buildOAuth1Provider($providerClass, $oauth1Server, array $config)
     {
-        $this->classExtends($providerClass, 'Laravel\Socialite\One\AbstractProvider');
-        $this->classExtends($oauth1Server, 'League\OAuth1\Client\Server\Server');
+        $this->classExtends($providerClass, \Laravel\Socialite\One\AbstractProvider::class);
+        $this->classExtends($oauth1Server, \League\OAuth1\Client\Server\Server::class);
 
         return new $providerClass(
             $this->app->offsetGet('request'), new $oauth1Server($config)
@@ -89,7 +91,7 @@ protected function buildOAuth1Provider($providerClass, $oauth1Server, array $con
      */
     protected function buildOAuth2Provider(SocialiteManager $socialite, $providerClass, array $config)
     {
-        $this->classExtends($providerClass, 'Laravel\Socialite\Two\AbstractProvider');
+        $this->classExtends($providerClass, \Laravel\Socialite\Two\AbstractProvider::class);
 
         return $socialite->buildProvider($providerClass, $config);
     }
@@ -101,7 +103,18 @@ protected function buildOAuth2Provider(SocialiteManager $socialite, $providerCla
      */
     protected function getConfig($providerName)
     {
-        return $this->app->offsetGet('config')['services.'.$providerName];
+        try {
+            /** @var Contracts\Config $config */
+            $config = $this->app->make('SocialiteProviders.config.'.$providerName);
+
+            if (!($config instanceof Contracts\Config)) {
+                throw new InvalidArgumentException('Config class does not implement config contract');
+            }
+
+            return $config->get();
+        } catch (\ReflectionException $e) {
+            return $this->app->offsetGet('config')['services.'.$providerName];
+        }
     }
 
     /**
diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 3dcfa50..ca689e1 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -20,10 +20,10 @@ public function it_returns_a_config_array()
         $secret = 'secret';
         $callbackUri = 'uri';
 
-        $result =  [
-            'client_id' => $key,
+        $result = [
+            'client_id'     => $key,
             'client_secret' => $secret,
-            'redirect' => $callbackUri
+            'redirect'      => $callbackUri,
         ];
 
         $config = new Config($key, $secret, $callbackUri);
diff --git a/tests/ManagerTestTrait.php b/tests/ManagerTestTrait.php
index 9687bb9..eab938f 100644
--- a/tests/ManagerTestTrait.php
+++ b/tests/ManagerTestTrait.php
@@ -17,9 +17,9 @@ protected function expectManagerInvalidArgumentException()
     protected function config()
     {
         return [
-            'client_id' => 'test',
+            'client_id'     => 'test',
             'client_secret' => 'test',
-            'redirect' => 'test',
+            'redirect'      => 'test',
         ];
     }
 
@@ -31,8 +31,8 @@ protected function config()
     protected function oauth1FormattedConfig(array $config)
     {
         return [
-            'identifier' => $config['client_id'],
-            'secret' => $config['client_secret'],
+            'identifier'   => $config['client_id'],
+            'secret'       => $config['client_secret'],
             'callback_uri' => $config['redirect'],
         ];
     }
@@ -42,7 +42,7 @@ protected function oauth1FormattedConfig(array $config)
      */
     protected function appMock()
     {
-        return m::mock('Illuminate\Contracts\Foundation\Application');
+        return m::mock(\Illuminate\Contracts\Foundation\Application::class);
     }
 
     /**
@@ -50,7 +50,7 @@ protected function appMock()
      */
     protected function socialiteMock()
     {
-        return m::mock('Laravel\Socialite\SocialiteManager');
+        return m::mock(\Laravel\Socialite\SocialiteManager::class);
     }
 
     protected function oauth2ProviderStub()
@@ -145,7 +145,7 @@ protected function providerConfigKey($providerName)
      */
     protected function buildRequest()
     {
-        return m::mock('\Illuminate\Http\Request');
+        return m::mock(\Illuminate\Http\Request::class);
     }
 
     /**
diff --git a/tests/OAuth1ProviderTest.php b/tests/OAuth1ProviderTest.php
index a771c89..d00e2c4 100644
--- a/tests/OAuth1ProviderTest.php
+++ b/tests/OAuth1ProviderTest.php
@@ -36,8 +36,15 @@ function ($closure) {
             ]
         );
 
+        $config = new Config(
+            $this->config()['client_id'],
+            $this->config()['client_secret'],
+            $this->config()['redirect']
+        );
+
         $app = $this->appMock();
-        $app->shouldReceive('make')->andReturn($socialite);
+        $app->shouldReceive('make')->with(\Laravel\Socialite\Contracts\Factory::class)->andReturn($socialite);
+        $app->shouldReceive('make')->with('SocialiteProviders.config.'.$providerName)->andReturn($config);
         $app->shouldReceive('offsetGet')->with('request')->andReturn($this->buildRequest());
         $app->shouldReceive('offsetGet')->with('config')->andReturn($this->servicesArray($providerName));
 
diff --git a/tests/OAuth2ProviderTest.php b/tests/OAuth2ProviderTest.php
index 61d1adf..3775c3d 100644
--- a/tests/OAuth2ProviderTest.php
+++ b/tests/OAuth2ProviderTest.php
@@ -21,6 +21,38 @@ public function it_passes()
         $this->assertTrue(true);
     }
 
+    /**
+     * @test
+     * @expectedException \SocialiteProviders\Manager\InvalidArgumentException
+     */
+    public function it_should_blow_up_if_the_config_passed_does_not_implement_config_contract()
+    {
+        $providerName = 'bar';
+
+        $socialite = $this->socialiteMock();
+        $socialite->shouldReceive('buildProvider')->withArgs([$this->oauth2ProviderStubName(), $this->config()])
+            ->andReturn($this->oauth2ProviderStub());
+        $socialite->shouldReceive('extend')->withArgs(
+            [
+                $providerName,
+                m::on(
+                    function ($closure) {
+                        $this->assertInstanceOf($this->oauth2ProviderStubName(), $closure());
+
+                        return is_callable($closure);
+                    }
+                ),
+            ]
+        );
+
+        $app = $this->appMock();
+        $app->shouldReceive('make')->with(\Laravel\Socialite\Contracts\Factory::class)->andReturn($socialite);
+        $app->shouldReceive('make')->with('SocialiteProviders.config.'.$providerName)->andReturn('foobar');
+
+        $s = new SocialiteWasCalled($app);
+        $s->extendSocialite($providerName, $this->oauth2ProviderStubName());
+    }
+
     /**
      * @test
      */
@@ -44,8 +76,15 @@ function ($closure) {
             ]
         );
 
+        $config = new Config(
+            $this->config()['client_id'],
+            $this->config()['client_secret'],
+            $this->config()['redirect']
+        );
+
         $app = $this->appMock();
-        $app->shouldReceive('make')->andReturn($socialite);
+        $app->shouldReceive('make')->with(\Laravel\Socialite\Contracts\Factory::class)->andReturn($socialite);
+        $app->shouldReceive('make')->with('SocialiteProviders.config.'.$providerName)->andReturn($config);
         $app->shouldReceive('offsetGet')->andReturn($this->servicesArray($providerName));
 
         $s = new SocialiteWasCalled($app);