UPI SDKs enable you to create and manage different UPI workflows. The Android UPI SDKs are designed to provide the app framework to support multiple layout and style properties.

This article consists of a step-by-step sequence for integrating with UPI SDKs on the Android operating system.

Before you begin

Take care of the following prerequisites before you begin with SDK setup:

• Fusion uses an authentication token to authenticate the SDK. To know how to generate an authentication token, see  SDK Authentication.
• Ensure to have SDK config files pay.json and upi.json.
• Ensure you have all assets required for UPI SDK and Pay SDK to function properly.

Getting Started with Android UPI SDK

Follow the steps below to integrate SDK:

1. Prepare the  SDK setup.
2. Initialize your SDK.

Step 1: Setting up the SDK

Follow the steps below to set up the SDK: 

1. Add SDK config files in your assets folder.
   

2. We host all our SDKs on a remotely accessible Maven Repository. Add the following code to your project level build.gradle to resolve dependencies.

   allprojects { repositories { .... maven { credentials { username = "<usename>" password = "<password>" } url 'https://apollo-SDK.zetaapps.in/repository/maven-releases/' authentication { basic(BasicAuthentication) } } maven { credentials { username = "<username>" password = "<password>" } url 'https://apollo-SDK.zetaapps.in/repository/maven-snapshots/' authentication { basic(BasicAuthentication) } } .... } }

   
   

3. Add dependencies for UPI SDK and Pay SDK in your app-level build.gradle.

   dependencies { ............ implementation 'apollo.sdk:upi:<latest-version>' implementation 'apollo.sdk:pay:<latest-version>' ............. }

Step 2: Initializing the SDK

1. Create instances of UPI SDK and Pay SDK in onCreate() method of Application.
   

   @Override public void onCreate() { super.onCreate(); setupPaySdk(this); setupUpiSdk(this); } private void setupUpiSdk(Context context) { upiSdk = new UpiSdkBuilder(context) .setExternalFontsMap(fontsMap) .setNotificationIcon(R.mipmap.ic_launcher_round) .setAccentColor(R.color.colorAccent) .setAppName(R.string.app_name) .build(); } private void setupPaySdk(Context context) { paySdk = new PaySdkBuilder(context) .useDeviceLock(true) .externalFontsMap(fontsMap) .build(); }

2. You can also provide the fonts you want to use. Place font files in your assets folder.
   
   

3. And initialize the fontsMap providing path values to your fonts. Set this font map when building SDKs in step 1.

   private static final Map<String, String> fontsMap = new HashMap<>(); static { fontsMap.put("ProximaNova-Regular".toLowerCase(), "fonts/ProximaNova-Regular.otf"); fontsMap.put("ProximaNova-Semibold".toLowerCase(), "fonts/ProximaNova-Semibold.otf"); fontsMap.put("ProximaNova-Bold".toLowerCase(), "fonts/ProximaNova-Bold.otf"); }

UPI SDK APIs

Authenticate

For a user to use UPI SDK through your app, you need to authenticate the user using a tenant token. This tenant token should be computed at your backend as it needs sensitive information. ‘callback’ is triggered for success or failure of authentication.

fun authenticate(
       tenantToken: String,
       callback: UpiSdkCallback<String>
)

UPI Registration

After UPI SDK authentication is successfully completed, you can trigger the UPI registration flow.

fun triggerRegistration(
       parentActivity: Activity,
       requestCode: Int,
       request: RegisterUpiRequest
)

The class RegisterUpiRequest expects these parameters.

data class RegisterUpiRequest(
       val phoneNumbers: List<String>,
       val firstName: String,
       val lastName: String,
       val userEmail: String,
       val bankDisplayName: String
)

Logout

Ensure to call logout on SDK when the user logs out from the app or the current user is switched to another user in the app.

fun logout()

Pay SDK APIs

Initialize

To initialize and prepare Pay SDK. ‘callback’ is triggered in case of success or failure.

fun initialise(
   callback: PaySdkCallback<Boolean>
)

PaySDKCallback the structure is as follows.

interface PaySdkCallback<T> {
   fun onSuccess(result: T)
   fun onFailure(t: Throwable)
}

Authenticate

When SDK is initialized successfully, you need to authenticate the user using a tenant token so that the user can use pay SDK features through your app. Authentication should be done at each app start. ‘callback’ is triggered in case of success or failure of authentication.

fun authenticate(
   tenantToken: String,
   callback: PaySdkCallback<String>
)

Setup

After successful authentication, you need to call the setup API.

fun setup(
   triggerActivity: Activity,
   request: SetupRequest,
   callback: PaySdkCallback<Boolean>
)

SetupRequest the structure is as follows.

data class SetupRequest(
   val ifi: Long,
   val vectorType: String,
   val vectorValue: String
)

It expects unique ifi , the ID of the issuer, a vector type (example - “ACCOUNTHOLDER”), and a unique vector value for the user.

Authentication Token

To get the authentication token of the user.

fun getAuthToken(
   callback: PaySdkCallback<String>
)

SDK State

To get the current state of SDK.

fun getSdkState(): String

Supported SDK states are:

object SdkState {
   const val SDK_NOT_READY = "SDK_NOT_READY"
   const val SDK_READY = "SDK_READY"
}

Initially, at each app start, SDK is at SDK_NOT_READY state. SDK comes to SDK_READY state when initialize, authenticate and setup steps are completed successfully. If SDK fails at any of these 3 steps, then it remains at SDK_NOT_READY state.

When SDK is in SDK_READY state, you will be able to make payments through various modes.

Send Money

Triggers an activity to start UPI payments flow.

fun sendMoneyFlow(
   triggerActivity: Activity,
   requestCode: Int?
)

Request Money

Triggers an activity to start the request money flow.

fun requestMoneyFlow(
   triggerActivity: Activity,
   requestCode: Int?
)

Received and Collect Requests

Shows all received collect requests. Users can approve or decline a collect request. Users can also see the collect requests sent by him and cancel the pending requests.

fun allRequestsFlow(
   triggerActivity: Activity,
   requestCode: Int?
)

Profile

Shows UPI QR code of the user.

fun profileFlow(
   triggerActivity: Activity,
   requestCode: Int?
)

Logout

Ensure to call logout on SDK when the user logs out from the app or the current user is switched to another user in the app.

fun logout(
   callback: PaySdkCallback<Boolean>
)