Mpesa plugin

Use this plugin to implement Lipa Na MPESA Online.

Getting Started

Credentials

  1. Create an account on the Safaricom Developer Portal
  2. Create a Lipa na MPESA Online App
  3. Get your keys -> ConsumerKey and ConsumerSecret

Usage

This plugin requires good understanding of the MPESA C2B concept, in as much as it will help you complete the process, you will also need to get things right in order to have it serve you right. With that said,

These two places will help you get started on a better gear.

  1. Safaricom API Tutorial
  2. Safaricom Developer Portal Docs

From here, it's now simpler to have it on your app.

  1. You will need to set the keys before initiating the payment.
    import 'package:mpesa_flutter_plugin/mpesa_flutter_plugin.dart';
    
    void main(){
    MpesaFlutterPlugin.setConsumerKey(<your-consumer-key>);
    MpesaFlutterPlugin.setConsumerSecret(<your-consumer-secret>);
    runApp(new MyApp());
    
    }
  1. Initiate the payment.

  dynamic transactionInitialisation;
 //Wrap it with a try-catch
  try {
  //Run it
  transactionInitialisation =
          await MpesaFlutterPlugin.initializeMpesaSTKPush(
                  businessShortCode: <your-code>,
                  transactionType: TransactionType.CustomerPayBillOnline,
                  amount: <amount-in-string-format>,
                  partyA: <user's-phone-to-request-payment>,
                  partyB: <your-code>,
                  callBackURL: <url-to-receive-payment-results>,
                  accountReference: <could-be-order-number>,
                  phoneNumber: <user's-phone-to-request-payment>,
                  baseUri: <live-or-sandbox-base-url>,
                  transactionDesc: <short-description>,
                  passKey: <your-passkey>);
                  
  } catch (e) {
  //you can implement your exception handling here.
  //Network unreachability is a sure exception.
  print(e.getMessage();
  }

With that you are pretty much done. Here is a breakdown of the params required :

  1. businessShortCode & partyB which you can apply from the developer portal mentioned in credentials, alternatively, use 174379 for test purposes.
  2. amount amount you expect from customer, in Ksh, string.
  3. phoneNumber & partyA the user's phone number to request payment from.
  4. callBackURL is where the payment results will be POSTed to you.
  5. accountReference what are the payments for? a short ref like users' order, account number...will be displayed to the user when requesting completion of payment.
  6. transactionDesc brief description of the tansaction. Not actually a description, a descriptive word. (Sometimes optional)
  7. passKey obtained from portal, will be blended with a few more things to generate your final password later, alternatively, use bfb279f9aa9bdbcf158e97dd71a467cd2e0c893059b10f78e6b72ada1ed2c919 for test purposes.

Docs at a glance.

When you place the request, and network does it's job well, the MPESA payment processor will validate your parameters and send your an acknowledgement or an error response immediately: case success: expect something of this sort in transactionInitialisation var.

  {
      "MerchantRequestID": "1466 - 405147 - 1",
      "CheckoutRequestID" : "ws_CO_DMZ_370754209_06062019172849964",
      "ResponseCode" : "0",
      "ResponseDescription": "Success.Request accepted for processing",
      "CustomerMessage" : "Success.Request accepted for processing"
  }

It means just that, accepted for processing, yet to be processed.

else, if some of your params are not accepted, expect something of this sort:

  {
      "requestId": "751-526141-1",
      "errorCode": "400.002.02",
      "errorMessage": "Bad Request - Invalid Amount"
  }

After this, the payment processor will proceed to seek the user and hopefully find, hopefully accepts the payment by giving correct pin, and hopefully they have enough amount ... case success, expect something like this on your backend, where the callBackURL points to:

  { "Body":
      { "stkCallback":
              { "MerchantRequestID": "1466-405147-1",
              "CheckoutRequestID": "ws_CO_DMZ_370754209_06062019172849964",
              "ResultCode": 0,
              "ResultDesc": "The service request is processed successfully.",
              "CallbackMetadata": {
                              "Item":
                                      [
                                          {
                                          "Name": "Amount",
                                          "Value": 100.00
                                          },
                                          
                                          {
                                          "Name": "MpesaReceiptNumber",
                                          "Value": "NF68F38A1G"
                                          },
                                          
                                          {
                                          "Name": "Balance"
                                          },
                                          
                                          {
                                          "Name": "TransactionDate",
                                          "Value": 20190606172857
                                          },
                                          
                                          {
                                          "Name": "PhoneNumber",
                                          "Value": 254710xxx574
                                          }
                                      ]
              
                          }

                }

        }

}

case failure of a transaction, this is a sample of your result:

{
    "Body":
        {
        "stkCallback":
                {
                "MerchantRequestID":"24963-1092493-1",
                "CheckoutRequestID":"ws_CO_DMZ_511000437_07062019123449116",
                "ResultCode":2001,
                "ResultDesc":"[MpesaCB - ]The initiator information is invalid."

                }

        }

}

That's what in the docs in summary.

Plugin In Action

Contributing

Pull Requests are welcomed to this plugin project on GitHub.

Libraries

api_caller
initializer
mpesa_flutter_plugin
payment_enums