If your Android app is available on the Google Play store, you can use the Google Pay API to integrate it. You may even set it up to accept credit cards. Follow the steps in this guide to integrate your app and set it up to accept credit cards.

Step 1: Select the Google Pay API version you want to use.

Step 2: Ask your payment provider for a payment token.

Step 3: Define the payment card networks that are supported.

Step 4: Describe the payment options that you accept.

Step 5: Create a PaymentsClient object

Step 6: Assess your ability to pay using the Google Pay API.

Step 7: Create a Payment Data Request object

Step 8: Create a user gesture event handler.

Step 9: Handle the response object.

Put everything together.