diff --git a/README.md b/README.md
index 9cfdac7..9a33179 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 
 An NPM Module built with NodeJs to help you with M-Pesa Daraja API calls.
 
+> **Looking for contributors who can help write tests.**
+
 Ready Methods
 
 - [x] C2BSIMULATE
@@ -29,7 +31,9 @@ Mpesa-Api uses Node Package Manager
 ```
 npm i mpesa-api
 ```
+
 Or Yarn
+
 ```
 yarn add mpesa-api
 ```
@@ -54,9 +58,9 @@ You Will need a few things from Safaricom before development.
 
 ```javascript
 // import package
-import { Mpesa } from 'mpesa-api';
+import { Mpesa } from "mpesa-api";
 //OR
-const Mpesa = require('mpesa-api').Mpesa;
+const Mpesa = require("mpesa-api").Mpesa;
 
 // create a new instance of the api
 const mpesa = new Mpesa(credentials, environment);
@@ -80,14 +84,15 @@ const credentials = {
     certificatepath: null
 };
 ```
+
 > You can get initiator password from Your Portal(production) or from test credentials(Sandbox). It will be the `Security Credential (Shortcode 1)`.
 
 Environment should be a string. It can be either 'production' or 'sandbox'
 
 ```javascript
-const environment = 'sandbox';
+const environment = "sandbox";
 //or
-const environment = 'production';
+const environment = "production";
 ```
 
 ## Methods and Api Calls
@@ -101,17 +106,17 @@ This API enables Business to Business (B2B) transactions between a business and
 ```javascript
 mpesa
   .b2b({
-    InitiatorName: 'Initiator Name',
+    InitiatorName: "Initiator Name",
     Amount: 1000 /* 1000 is an example amount */,
-    PartyA: 'Party A',
-    PartyB: 'Party B',
-    AccountReference: 'Account Reference',
-    QueueTimeOutURL: 'Queue Timeout URL',
-    ResultURL: 'Result URL',
-    CommandID: 'Command ID' /* OPTIONAL */,
+    PartyA: "Party A",
+    PartyB: "Party B",
+    AccountReference: "Account Reference",
+    QueueTimeOutURL: "Queue Timeout URL",
+    ResultURL: "Result URL",
+    CommandID: "Command ID" /* OPTIONAL */,
     SenderIdentifierType: 4 /* OPTIONAL */,
     RecieverIdentifierType: 4 /* OPTIONAL */,
-    Remarks: 'Remarks' /* OPTIONAL */
+    Remarks: "Remarks" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -144,15 +149,15 @@ This API enables Business to Customer (B2C) transactions between a company and c
 ```javascript
 mpesa
   .b2c({
-    InitiatorName: 'Initiator Name',
+    InitiatorName: "Initiator Name",
     Amount: 1000 /* 1000 is an example amount */,
-    PartyA: 'Party A',
-    PartyB: 'Party B',
-    QueueTimeOutURL: 'Queue Timeout URL',
-    ResultURL: 'Result URL',
-    CommandID: 'Command ID' /* OPTIONAL */,
-    Occasion: 'Occasion' /* OPTIONAL */,
-    Remarks: 'Remarks' /* OPTIONAL */
+    PartyA: "Party A",
+    PartyB: "Party B",
+    QueueTimeOutURL: "Queue Timeout URL",
+    ResultURL: "Result URL",
+    CommandID: "Command ID" /* OPTIONAL */,
+    Occasion: "Occasion" /* OPTIONAL */,
+    Remarks: "Remarks" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -189,10 +194,10 @@ M-Pesa completes or cancels the transaction depending on the validation response
 ```javascript
 mpesa
   .c2bregister({
-    ShortCode: 'Short Code',
-    ConfirmationURL: 'Confirmation URL',
-    ValidationURL: 'Validation URL',
-    ResponseType: 'Response Type'
+    ShortCode: "Short Code",
+    ConfirmationURL: "Confirmation URL",
+    ValidationURL: "Validation URL",
+    ResponseType: "Response Type"
   })
   .then(response => {
     //Do something with the response
@@ -219,8 +224,8 @@ mpesa
     ShortCode: 123456,
     Amount: 1000 /* 1000 is an example amount */,
     Msisdn: 254792123456,
-    CommandID: 'Command ID' /* OPTIONAL */,
-    BillRefNumber: 'Bill Reference Number' /* OPTIONAL */
+    CommandID: "Command ID" /* OPTIONAL */,
+    BillRefNumber: "Bill Reference Number" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -247,13 +252,13 @@ The Account Balance API requests for the account balance of a shortcode.
 ```javascript
 mpesa
   .accountBalance({
-    Initiator: 'Initiator Name',
-    PartyA: 'Party A',
-    IdentifierType: 'Identifier Type',
-    QueueTimeOutURL: 'Queue Timeout URL',
-    ResultURL: 'Result URL',
-    CommandID: 'Command ID' /* OPTIONAL */,
-    Remarks: 'Remarks' /* OPTIONAL */
+    Initiator: "Initiator Name",
+    PartyA: "Party A",
+    IdentifierType: "Identifier Type",
+    QueueTimeOutURL: "Queue Timeout URL",
+    ResultURL: "Result URL",
+    CommandID: "Command ID" /* OPTIONAL */,
+    Remarks: "Remarks" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -282,15 +287,15 @@ Transaction Status API checks the status of a B2B, B2C and C2B APIs transactions
 ```javascript
 mpesa
   .transactionStatus({
-    Initiator: 'Initiator',
-    TransactionID: 'Transaction ID',
-    PartyA: 'Party A',
-    IdentifierType: 'Identifier Type',
-    ResultURL: 'Result URL',
-    QueueTimeOutURL: 'Queue Timeout URL',
-    CommandID: 'Command ID' /* OPTIONAL */,
-    Remarks: 'Remarks' /* OPTIONAL */,
-    Occasion: 'Occasion' /* OPTIONAL */
+    Initiator: "Initiator",
+    TransactionID: "Transaction ID",
+    PartyA: "Party A",
+    IdentifierType: "Identifier Type",
+    ResultURL: "Result URL",
+    QueueTimeOutURL: "Queue Timeout URL",
+    CommandID: "Command ID" /* OPTIONAL */,
+    Remarks: "Remarks" /* OPTIONAL */,
+    Occasion: "Occasion" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -323,13 +328,13 @@ mpesa
   .lipaNaMpesaOnline({
     BusinessShortCode: 123456,
     Amount: 1000 /* 1000 is an example amount */,
-    PartyA: 'Party A',
-    PhoneNumber: 'Phone Number',
-    CallBackURL: 'CallBack URL',
-    AccountReference: 'Account Reference',
-    passKey: 'Lipa Na Mpesa Pass Key',
-    TransactionType: 'Transaction Type' /* OPTIONAL */,
-    TransactionDesc: 'Transaction Description' /* OPTIONAL */
+    PartyA: "Party A",
+    PhoneNumber: "Phone Number",
+    CallBackURL: "CallBack URL",
+    AccountReference: "Account Reference",
+    passKey: "Lipa Na Mpesa Pass Key",
+    TransactionType: "Transaction Type" /* OPTIONAL */,
+    TransactionDesc: "Transaction Description" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -360,8 +365,8 @@ mpesa
 mpesa
   .lipaNaMpesaQuery({
     BusinessShortCode: 123456,
-    CheckoutRequestID: 'Checkout Request ID',
-    passKey: 'Lipa Na Mpesa Pass Key'
+    CheckoutRequestID: "Checkout Request ID",
+    passKey: "Lipa Na Mpesa Pass Key"
   })
   .then(response => {
     //Do something with the response
@@ -386,16 +391,16 @@ Reverses a B2B, B2C or C2B M-Pesa transaction.
 ```javascript
 mpesa
   .reversal({
-    Initiator: 'Initiator',
-    TransactionID: 'Transaction ID',
+    Initiator: "Initiator",
+    TransactionID: "Transaction ID",
     Amount: 1000 /* 1000 is an example amount */,
-    ReceiverParty: 'Reciever Party',
-    ResultURL: 'Result URL',
-    QueueTimeOutURL: 'Queue Timeout URL',
-    CommandID: 'Command ID' /* OPTIONAL */,
+    ReceiverParty: "Reciever Party",
+    ResultURL: "Result URL",
+    QueueTimeOutURL: "Queue Timeout URL",
+    CommandID: "Command ID" /* OPTIONAL */,
     RecieverIdentifierType: 11 /* OPTIONAL */,
-    Remarks: 'Remarks' /* OPTIONAL */,
-    Occasion: 'Ocassion' /* OPTIONAL */
+    Remarks: "Remarks" /* OPTIONAL */,
+    Occasion: "Ocassion" /* OPTIONAL */
   })
   .then(response => {
     //Do something with the response
@@ -435,19 +440,20 @@ mpesa
 
 If you Wish to build
 
-1.  Clone this repo
-2.  CD into repo
-3.  run `npm install` to install dependencies
-4.  run `npm run build` to build
-5.  run `npm run start:dev` to run package in development mode
+1. Clone this repo
+2. CD into repo
+3. run `npm install` to install dependencies
+4. run `npm run build` to build
+5. run `npm run start:dev` to run package in development mode
 
 ## Contributing
 
-1.  Fork the project then clone the forked project
-2.  Create your feature branch: `git checkout -b my-new-feature`
-3.  Commit your changes: `git commit -m 'Add some feature'`
-4.  Push to the branch: `git push origin my-new-feature`
-5.  Submit a pull request.
+1. Fork the project then clone the forked project
+2. Create your feature branch: `git checkout -b my-new-feature`
+3. Make your changes and add name to Contributors list below.
+4. Commit your changes: `git commit -m 'Add some feature'`
+5. Push to the branch: `git push origin my-new-feature`
+6. Submit a pull request.
 
 ## Credits
 
diff --git a/package-lock.json b/package-lock.json
index 18d2f20..79de42a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,18 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@types/chai": {
+      "version": "4.1.7",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.1.7.tgz",
+      "integrity": "sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==",
+      "dev": true
+    },
+    "@types/mocha": {
+      "version": "5.2.7",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
+      "integrity": "sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==",
+      "dev": true
+    },
     "@types/node": {
       "version": "11.13.11",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-11.13.11.tgz",
@@ -108,6 +120,12 @@
         "string-width": "^2.0.0"
       }
     },
+    "ansi-colors": {
+      "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
+      "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==",
+      "dev": true
+    },
     "ansi-escapes": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
@@ -189,6 +207,12 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -350,6 +374,12 @@
         }
       }
     },
+    "browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -391,6 +421,20 @@
       "integrity": "sha512-mYQLZnx5Qt1JgB1WEiMCf2647plpGeQ2NMR/5L0HNZzGQo4fuSPnK+wjfPnKZV0aiJDgzmWqqkV/g7JD+DW0qw==",
       "dev": true
     },
+    "chai": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.2",
+        "deep-eql": "^3.0.1",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.1.0",
+        "type-detect": "^4.0.5"
+      }
+    },
     "chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -408,6 +452,12 @@
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       "dev": true
     },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
     "chokidar": {
       "version": "2.1.6",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.6.tgz",
@@ -478,6 +528,23 @@
       "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
       "dev": true
     },
+    "cliui": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
+      "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
+      "dev": true,
+      "requires": {
+        "string-width": "^2.1.1",
+        "strip-ansi": "^4.0.0",
+        "wrap-ansi": "^2.0.0"
+      }
+    },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -584,12 +651,27 @@
         }
       }
     },
+    "decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true
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     "decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
       "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
       "dev": true
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "^4.0.0"
+      }
+    },
     "deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -602,6 +684,15 @@
       "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
       "dev": true
     },
+    "define-properties": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
+      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
+      "dev": true,
+      "requires": {
+        "object-keys": "^1.0.12"
+      }
+    },
     "define-property": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
@@ -679,6 +770,40 @@
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       "dev": true
     },
+    "end-of-stream": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
+      "integrity": "sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==",
+      "dev": true,
+      "requires": {
+        "once": "^1.4.0"
+      }
+    },
+    "es-abstract": {
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
+      "integrity": "sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==",
+      "dev": true,
+      "requires": {
+        "es-to-primitive": "^1.2.0",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3",
+        "is-callable": "^1.1.4",
+        "is-regex": "^1.0.4",
+        "object-keys": "^1.0.12"
+      }
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+    "es-to-primitive": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
+      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "dev": true,
+      "requires": {
+        "is-callable": "^1.1.4",
+        "is-date-object": "^1.0.1",
+        "is-symbol": "^1.0.2"
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     "escape-string-regexp": {
       "version": "1.0.5",
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@@ -1043,6 +1168,32 @@
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+    "find-up": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "locate-path": "^3.0.0"
+      }
+    },
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+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
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+      "dev": true,
+      "requires": {
+        "is-buffer": "~2.0.3"
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+      "dependencies": {
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+          "dev": true
+        }
+      }
+    },
     "flat-cache": {
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@@ -1647,12 +1798,30 @@
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       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
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+    "get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
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+    },
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
+      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
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       "dev": true
     },
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+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "dev": true
+    },
     "pify": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
@@ -2579,6 +3057,16 @@
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       "dev": true
     },
+    "pump": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
+      "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+      "dev": true,
+      "requires": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
     "punycode": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
@@ -2676,6 +3164,18 @@
       "integrity": "sha1-jcrkcOHIirwtYA//Sndihtp15jc=",
       "dev": true
     },
+    "require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
+      "dev": true
+    },
+    "require-main-filename": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+      "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+      "dev": true
+    },
     "resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
@@ -2767,6 +3267,12 @@
         "semver": "^5.0.3"
       }
     },
+    "set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
+      "dev": true
+    },
     "set-value": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
@@ -3221,6 +3727,12 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
     "typescript": {
       "version": "3.4.5",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz",
@@ -3406,6 +3918,21 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "widest-line": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
@@ -3421,6 +3948,53 @@
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3453,12 +4027,144 @@
       "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
       "dev": true
     },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
+    "yargs": {
+      "version": "13.2.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
+      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "os-locale": "^3.1.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
+      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+          "dev": true
+        }
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
+      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.11",
+        "yargs": "^12.0.5"
+      },
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+        "camelcase": {
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+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
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+          "dev": true
+        },
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+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
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+        "require-main-filename": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "12.0.5",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
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+          "dev": true,
+          "requires": {
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "11.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
     "yn": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
diff --git a/package.json b/package.json
index 8125ab7..bb2bc10 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "start": "node lib/index.js",
     "dev": "nodemon --exec ./node_modules/.bin/ts-node -- ./src/index",
     "build": "tsc && npm run copy-keys",
-    "copy-keys": "ncp src/keys lib/keys"
+    "copy-keys": "ncp src/keys lib/keys",
+    "test": "mocha -r ts-node/register src/**/*.spec.ts"
   },
   "keywords": [
     "mpesa",
@@ -21,9 +22,13 @@
   "author": "Newton Munene <newtonmunene99@gmail.com>",
   "license": "MIT",
   "devDependencies": {
+    "@types/chai": "^4.1.7",
+    "@types/mocha": "^5.2.7",
     "@types/node": "^11.13.11",
     "@typescript-eslint/parser": "^1.9.0",
+    "chai": "^4.2.0",
     "eslint": "^5.16.0",
+    "mocha": "^6.1.4",
     "ncp": "^2.0.0",
     "nodemon": "^1.19.0",
     "ts-node": "^8.1.0",
diff --git a/src/helpers/interfaces.ts b/src/helpers/interfaces.ts
index a84e7ed..9449680 100644
--- a/src/helpers/interfaces.ts
+++ b/src/helpers/interfaces.ts
@@ -67,7 +67,7 @@ export interface stkpushinterface {
   Amount: number;
   PartyA: string;
   PartyB: string;
-  PhoneNumber: number;
+  PhoneNumber: string;
   CallBackURL: string;
   AccountReference: string;
   passKey: any;
diff --git a/src/index.spec.ts b/src/index.spec.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/index.ts b/src/index.ts
index 50743e5..72ebf38 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -75,7 +75,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -119,7 +119,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -172,7 +172,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -237,7 +237,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -285,7 +285,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -341,7 +341,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -389,7 +389,7 @@ export class Mpesa {
               resolve(response.data);
             })
             .catch(error => {
-              reject(error);
+              reject(error.response);
             });
         })
         .catch(error => {
@@ -415,7 +415,7 @@ export class Mpesa {
           resolve(response.data.access_token);
         })
         .catch(error => {
-          reject(error);
+          reject(error.response);
         });
     });
   }