Interswitch Payment SDK

This library aids in processing payment through the following channels

• Card
• Verve Wallet
• QR Code
• USSD
• Bank Transfer

Usage

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 project, add the following to your root project's build.gradle

    allprojects {
        repositories {
            google()
            jcenter()
            mavenCentral()
        }
        
        //... other stuff
    }

Then add the following to the your app project's build.gradle, check for the latest version

    
    dependencies {
        def versionName = '1.1.0'
        implementation "com.interswitchng:isw-mobile-payment-sdk:$versionName"
    }

now build the project.

Configuration

You would also need to configure the project with your merchant credentials, and if you would like to customize the colors you would need to override the resource values.

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // configure sdk
        configureSDK();
    }

    public void configureSDK() {
        // use provided configuration for your merchant account
        String clientId = "<your clientId>"; 
        String merchantCode = "<your merchantCode>";
        String clientSecret = "<your clientSecret>";

        // create sdk configuration
        IswSdkConfig config = new IswSdkConfig(clientId, 
                        clientSecre, merchantCode, "566");

        // uncomment to set environment, default is Environment.TEST
        // config.setEnv(Environment.SANDBOX);
        
        // initialize sdk at boot of application
        IswMobileSdk.initialize(this, config);
    }
}

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

Performing Transactions

You can perform a transaction, once the SDK is configured, like so:

1. First you would need to have your activity implement the IswMobileSdk.IswPaymentCallback interface

    public class PurchaseActivity extends AppCompatActivity implements IswMobileSdk.IswPaymentCallback {

        // ... other methods
        
        // user cancelled payment with out completion
        @Override
        public void onUserCancel() {
            // handle cancellation
        }

        // user completed the payment
        @Override
        public void onPaymentCompleted(@NonNull IswPaymentResult result) {
            // handle payment result
        }
    }

2. Once you have the implemented the interface, you can trigger payments

    public class PurchaseActivity extends AppCompatActivity implements IswMobileSdk.IswPaymentCallback {
        
        @Override
        protected void onCreate() {
            //.. other stuff
            payButton.setOnclickListener((v) -> {
                initiatePayment();
            });
        }
        
        private void initiatePayment() {
            // set customer info
            String 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>";
                        
            // amount in kobo e.g. "N500.00" -> 50000
            int amount = providedAmount; // e.g. 50000
                
            // create payment info
            IswPaymentInfo iswPaymentInfo = new IswPaymentInfo(
                customerId,
                customerName, 
                customerEmail,
                customerMobile,
                currencyCode,
                reference,
                amount
            );

            // trigger payment
            // parameters
            // -- paymentInfo: the payment information to be processed
            // -- activityCallback: the IswPaymentCallback that receives the result
            IswMobileSdk.getInstance().paypay(
                iswPaymentInfo, 
                this
            );
        }
        
    }

Handling Result

To process the result received onPaymentCompleted callback, here are the fields' attributes of the IswPaymentResult

Field	Type	meaning
responseCode	String	txn response code
responseDescription	String	txn response code description
isSuccessful	boolean	flag indicates if txn is successful
transactionReference	String	reference for txn
amount	int	txn amount
channel	PaymentChannel	channel used to make payment: one of CARD, WALLET, QR, USSD or TRANSFER

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

Proguard

If you are using proguard, add the following to your code

    # ISW classes
    -keep public class com.interswitchng.iswmobilesdk.IswMobileSdk {
      public protected *;
    }
    
    -keep public interface com.interswitchng.iswmobilesdk.IswMobileSdk$IswPaymentCallback {*;}
    
    -keep public class com.interswitchng.iswmobilesdk.shared.models.core.** {
        public protected *;
        !transient <fields>;
    }
    -keep public class com.interswitchng.iswmobilesdk.shared.models.payment.** {
        public protected *;
        !transient <fields>;
    }

    # SC provider
    -keep class org.spongycastle.**
    -dontwarn org.spongycastle.jce.provider.X509LDAPCertStoreSpi
    -dontwarn org.spongycastle.x509.util.LDAPStoreHelper
    
    
    
    # Android specifics
    -keep public class * extends android.app.Activity
    -keep public class * extends android.app.Application
    -keep public class * extends android.app.Service
    -keep public class * extends android.content.BroadcastReceiver
    -keep public class * extends android.content.ContentProvider
    
    -dontwarn android.support.**
    -dontwarn javax.annotation.**
    
    -keep public class * extends android.view.View {
        public <init>(android.content.Context);
        public <init>(android.content.Context, android.util.AttributeSet);
        public <init>(android.content.Context, android.util.AttributeSet, int);
        public void set*(...);
    }
    
    -keepclasseswithmembers class * {
        public <init>(android.content.Context, android.util.AttributeSet);
    }
    
    -keepclasseswithmembers class * {
        public <init>(android.content.Context, android.util.AttributeSet, int);
    }
    
    -keepclassmembers class * extends android.content.Context {
       public void *(android.view.View);
       public void *(android.view.MenuItem);
    }
    
    
    -keep public class * extends androidx.fragment.app.Fragment {
        public protected *;
    }
    
    -keepclassmembers class * implements android.os.Parcelable {
        static ** CREATOR;
    }
    
    -keepclassmembers class **.R$* {
        public static <fields>;
    }
    
    -keepclassmembers class * {
        @android.webkit.JavascriptInterface <methods>;
    }