As getAuthCode and tradePay have already been integrated for payment, in order to allow A+Rewards reuse both jsapi, you need to perform the following steps:

Android

Step 1. Add Jsapi file to your project

1. Add the alipayplusjsapi (the .arr file) to the libs folder of your project.
2. Add the following code to the build.gradle file of your module.

dependencies {

    implementation fileTree(dir: "libs", include: ["*.jar", "*.aar"])
   
}

Step 2. Set up the JSAPI

IAPConnect.init(this, initConfig, new InitCallback() {
    @Override
    public void onSuccess() {
        AlipayPlusClientJSAPI.getInstance().setUp(); 
    }

    @Override
    public void onFailure(InitErrorCode initErrorCode, String s) {
        Log.d(TAG, s);
    }
});

IOS

Step 1. Add Jsapi file to your project

Add the MPPAlipayPlusClientJSAPI file to the Build Phases -> Link Binary with Libraries of the project.

Step 2. Set up the JSAPI

IAPConnectClient.sharedInstance()?.initWithContext(config, success: {
    MPPAlipayPlusClientJSAPI.setUp()
}, failure: { (error, errorMessage) in

            })