isw_mobile_sdk

This library aids in processing payment through the following channels

• x Card
• x Verve Wallet
• x QR Code
• X USSD

Getting started

There are three steps you would have to complete to set up the SDK and perform transaction

• Install the SDK as a dependency
• Configure the SDK with Merchant Information
• Initiate payment with customer details

Installation

To install the sdk add the following to your dependencies map in pubspec.yaml

dependencies:
  #.... others

  # add the dependency for sdk
  isw_mobile_sdk: '<latest-version>'

Configuration

You would also need to configure the project with your merchant credentials.

import 'dart:async';
import 'package:isw_mobile_sdk/isw_mobile_sdk.dart';


class _MyAppState extends State<MyApp> {

  @override
  void initState() {
    super.initState();
    initSdk();
  }

    // messages to SDK are asynchronous, so we initialize in an async method.
  Future<void> initSdk() async {

    // messages may fail, so we use a try/catch PlatformException.
    try {
        String  merchantId = "your-merchant-id",
        merchantCode = "your-merchant-code",
        merchantSecret = "your-merchant-secret",
        currencyCode = "currency-code"; // e.g  566 for NGN

        var config = new IswSdkConfig (
            merchantId, 
            merchantKey, 
            merchantCode, 
            currencyCode
        );

        // initialize the sdk
        await IswMobileSdk.initialize(config);
        // intialize with environment, default is Environment.TEST
        // IswMobileSdk.initialize(config, Environment.SANDBOX);

    } on PlatformException {}
  }
}

Once the SDK has been initialized, you can then perform transactions.

Performing Transactions

You can perform a transaction, once the SDK is configured, by providing the payment info and payment callbacks, like so:

  Future<void> pay(int amount) async {

    var customerId = "<customer-id>",
        customerName = "<customer-name>",
        customerEmail = "<customer.email@domain.com>",
        customerMobile = "<customer-phone>",
        // generate a unique random
        // reference for each transaction
        reference = "<your-unique-ref>";

    
    // initialize amount
    // amount expressed in lowest
    // denomination (e.g. kobo): "N500.00" -> 50000
    int amountInKobo = amount * 100

    // create payment info
    var iswPaymentInfo = new IswPaymentInfo(
        customerId, 
        customerName,
        customerEmail, 
        customerMobile, 
        reference, 
        amountInKobo
    );


    // trigger payment
    var result = await IswMobileSdk.pay(iswPaymentInfo);

    // process result
    handleResult(result)
  }

Handling Result

To handle result all you need to do is process the result in the callback methods: whenever the user cancels, the value would be null and hasValue would be false. When the transaction is complete, hasValue would be true and value would have an instance of IswPaymentResult: an object with the below fields.

void handleResult(Optional<IswPaymentResult> result) {

    if (result.hasValue) {
        // process result
        showPaymentSuccess(result.value);
    } else { 
        showPaymentError()
    }
    
}

And that is it, you can start processing payment in your flutter app.

Note

The Android Platform might have build exceptions, showing dexing issues, and you would need to enable Multidexing to build successfully. You can take a look at the Application class in the android project, for reference.