MainActivity.java

package com.mobile.emvpay;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent intent = getIntent();
        if (intent != null && Intent.ACTION_VIEW.equals(intent.getAction())) {
            setContentView(R.layout.activity_checkout);
            Uri data = intent.getData();
            if (data != null) {
                Button payButton = findViewById(R.id.pay_now_button);
                payButton.setOnClickListener(view -> {
                    Intent paymentActivityIntent = new Intent(intent);
                    paymentActivityIntent.setClass(MainActivity.this, PaymentActivity.class);
                    startActivity(paymentActivityIntent);
                });
            }
        }else{
            setContentView(R.layout.activity_main);
        }

    }
}