CardPaymentModule.java

import static androidx.core.app.ActivityCompat.startActivityForResult;

import android.app.Activity;
import android.content.Intent;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.facebook.react.bridge.ActivityEventListener;
import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.PromiseImpl;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

import org.json.JSONException;
import org.json.JSONObject;

public class CardPaymentModule extends ReactContextBaseJavaModule implements ActivityEventListener {

    final int TRANS_PAY_CARD = 1325;

    CardPaymentModule(ReactApplicationContext context) {
        super(context);
        context.addActivityEventListener(this);
    }

    @NonNull
    @Override
    public String getName() {
        return "CardPaymentModule";
    }

    @ReactMethod
    public Promise createCardTransaction(String amount){
        Activity currentActivity = getCurrentActivity();
        PromiseImpl localPromise = new PromiseImpl(null, null);
        Intent cardPaymentIntent = new Intent();
        cardPaymentIntent.setAction("com.awesomebank.paymentapp");
        cardPaymentIntent.putExtra("version", "1.3.15");
        cardPaymentIntent.putExtra("transactionType", "PAYMENT");

        if (currentActivity == null){
            localPromise.reject("NO_ACTIVITY", "Activity doesn't exist")
            return localPromise;
        }

        JSONObject jsObj = new JSONObject();
        try {
            jsObj.put("paymentType", "CARD");
            jsObj.put("amount", amount);
            cardPaymentIntent.putExtra("transctionData", jsObj.toString());
        }
        catch (JSONException jse){
           System.out.println("createCardTransaction exception: "+jse.getMessage());
        }

        return localPromise;
    }


    @Override
    public void onActivityResult(Activity activity, int requestCode, int resultCode, @Nullable Intent data) {
        if (requestCode == TRANS_PAY_CARD){

        }
    }

    @Override
    public void onNewIntent(Intent intent) {

    }
}