How Do I Integrate Google Pay App on Android?

Android, Android Apps

Integrating the Google Pay app on Android is a straightforward process that allows users to make seamless and secure payments. In this tutorial, we will walk you through the steps to integrate Google Pay into your Android app, ensuring a smooth payment experience for your users.

Prerequisites

Before we begin, make sure you have the following:

  • An Android development environment: Set up Android Studio or any other preferred IDE.
  • A Google Pay account: Sign up for a Google Pay account if you haven’t already.
  • An active project: Create a new project in your IDE or use an existing one.

Step 1: Add Google Play Services Dependency

To integrate Google Pay into your Android app, you need to add the necessary dependencies. Open your project’s build.gradle file and ensure that the following dependency is added:

<dependencies>
    <!-- Other dependencies -->
    <implementation 'com.google.android.gms:play-services-wallet:20.0.0' />
</dependencies>

Step 2: Enable Google Pay API

In order to use Google Pay in your app, you need to enable the necessary API in the Google Cloud Console. Follow these steps:

  1. Login: Log in to the Google Cloud Console.
  2. Create a new project: If you don’t have an existing project, create a new one by clicking on the “Select a project” dropdown and choosing “New Project”.
  3. Enable the API: In the Cloud Console, navigate to the “APIs & Services” section and click on “Library”. Search for “Google Pay API” and enable it for your project.
  4. Set up credentials: Once enabled, go to the “Credentials” section and create an API key or an OAuth client ID, depending on your use case.

Step 3: Implement Google Pay Button

Now that you have set up the necessary dependencies and enabled the Google Pay API, it’s time to implement the Google Pay button in your app. Add the following code in your desired layout XML file:

<Button
    android:id="@+id/googlePayButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Pay with Google Pay"
    />

You can customize the button’s appearance as per your app’s design requirements.

Step 4: Initialize Google Pay API Client

In order to use Google Pay functionalities, you need to initialize the Google Pay API client in your activity or fragment. Add the following code snippet in your Java/Kotlin file:

<!-- For Java -->
GooglePayClient googlePayClient = new Wallet.WalletOptions.Builder()
        .setEnvironment(WalletConstants.ENVIRONMENT_TEST)
        .build().getPaymentsClient(this);

<!-- For Kotlin -->
val googlePayClient = Wallet.getPaymentsClient(
        this,
        Wallet.Builder()
            .ENVIRONMENT_TEST)
            .build()
    )

Make sure to replace ENVIRONMENT_TEST with ENVIRONMENT_PRODUCTION when your app is ready for production.

Step 5: Process Payment Request

To process a payment request with Google Pay, you need to create a PaymentDataRequest. Add the following code snippet:

<!-- For Java -->
PaymentDataRequest request = PaymentDataRequest.fromJson(
        new JSONObject()
            .put("apiVersion", 2)
            .put("apiVersionMinor", 0)
            .put("allowedPaymentMethods", new JSONArray().put(getCardPaymentMethod()))
            .put("transactionInfo", getTransactionInfo())
            .toString()
    );

<!-- For Kotlin -->
val request = PaymentDataRequest.fromJson(
        JSONObject()
            .put("allowedPaymentMethods", JSONArray().toString()
    )

The getCardPaymentMethod() and getTransactionInfo() methods should be implemented according to your specific payment requirements.

Congratulations!

You have successfully integrated the Google Pay app on Android. Your users can now make payments using Google Pay within your app, providing them with a convenient and secure payment experience.

This tutorial covered the essential steps, from adding dependencies and enabling the API to implementing the Google Pay button and processing payment requests. Remember to test thoroughly before deploying your app to production.

You are now equipped with the knowledge to enhance your Android app with Google Pay integration. Happy coding!