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June 05, 2024

Implementing Google Payment in React Native

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In today's digital world, integrating a seamless payment gateway is crucial for any app handling transactions. Google Pay is a popular choice due to its wide user base and secure infrastructure. In this blog, we’ll walk you through the steps to implement Google Pay in a React Native application.

 

Prerequisites

Before we start, ensure you have the following:

  1. React Native development environment: You should have Node.js, npm, React Native CLI, and Android Studio installed.
  2. Google Play Console Account: To use Google Pay, you need to register your application on the Google Play Console.

 

Step 1: Install Required Packages

First, we need to install the necessary packages for Google Pay. React Native doesn’t have built-in support for Google Pay, so we’ll use the react-native-google-pay package.

Run the following command to install it:

npm install react-native-google-pay

 

Link the package to your React Native project:

npx react-native link react-native-google-pay

 

For newer versions of React Native (0.60+), auto-linking should handle this, but manual linking is still required for native modules.

 

Step 2: Configure Android Settings

Modify android/app/build.gradle

Add Google Play services to your project by including it in your android/app/build.gradle file:

dependencies {
    implementation 'com.google.android.gms:play-services-wallet:18.1.3'
}

 

Update Android Manifest

Open android/app/src/main/AndroidManifest.xml and add the following permissions and meta-data:

<uses-permission android:name="android.permission.INTERNET" />

<application ... >
    ...
    <meta-data
        android:name="com.google.android.gms.wallet.api.enabled"
        android:value="true" />
</application>

 

Step 3: Set Up Google Pay API

To use Google Pay, you need to configure a payment profile in the Google Pay API. Here’s a basic configuration:

const allowedCardNetworks = ["AMEX", "DISCOVER", "JCB", "MASTERCARD", "VISA"];
const allowedAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0,
};

const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    gateway: 'example', // Change 'example' to your payment gateway
    gatewayMerchantId: 'exampleGatewayMerchantId', // Your gateway merchant ID
  },
};

const cardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods,
    allowedCardNetworks,
  },
  tokenizationSpecification,
};

const googlePayRequestData = {
  ...baseRequest,
  allowedPaymentMethods: [cardPaymentMethod],
  transactionInfo: {
    totalPriceStatus: 'FINAL',
    totalPrice: '10.00',
    currencyCode: 'USD',
  },
  merchantInfo: {
    merchantName: 'Example Merchant', // Your merchant name
  },
};

 

Step 4: Implement Google Pay in React Native

Now, let’s implement the Google Pay button and handle the payment process.

 

Import and Initialize Google Pay

In your React Native component, import the necessary modules and initialize Google Pay:

import React from 'react';
import { View, Button, Alert } from 'react-native';
import GooglePay from 'react-native-google-pay';

GooglePay.setEnvironment(GooglePay.ENVIRONMENT_TEST);

const allowedPaymentNetworks = ['VISA', 'MASTERCARD'];
const allowedPaymentMethods = ['PAN_ONLY', 'CRYPTOGRAM_3DS'];

const requestData = {
  cardPaymentMethod: {
    tokenizationSpecification: {
      type: 'PAYMENT_GATEWAY',
      gateway: 'example',
      gatewayMerchantId: 'exampleGatewayMerchantId',
    },
    allowedCardNetworks: allowedPaymentNetworks,
    allowedAuthMethods: allowedPaymentMethods,
  },
  transactionInfo: {
    totalPriceStatus: 'FINAL',
    totalPrice: '10.00',
    currencyCode: 'USD',
  },
  merchantInfo: {
    merchantName: 'Example Merchant',
  },
};

 

Add Google Pay Button and Handle Payment

Add a button in your component to initiate the Google Pay payment process:

const GooglePayButton = () => {
  const onPress = () => {
    GooglePay.isReadyToPay(allowedPaymentNetworks, allowedPaymentMethods)
      .then((ready) => {
        if (ready) {
          GooglePay.requestPayment(requestData)
            .then((token) => {
              // Send a token to your backend to process the payment
              Alert.alert('Payment Success', `Token: ${token}`);
            })
            .catch((error) => Alert.alert('Payment Error', error.message));
        } else {
          Alert.alert('Google Pay is not available on this device.');
        }
      })
      .catch((error) => Alert.alert('Error', error.message));
  };

  return (
    <View>
      <Button title="Pay with Google Pay" onPress={onPress} />
    </View>
  );
};

export default GooglePayButton;

 

Step 5: Testing

Before going live, test the Google Pay integration thoroughly. Use Google’s test cards and ensure transactions are processed correctly.

  1. Run your app: Use npx react-native run-android to start the application on an emulator or a physical device.
  2. Test the payment flow: Ensure the button appears and that the payment process completes successfully using Google’s test environment.

 

Conclusion

Implementing Google Pay in your React Native app enhances the user experience by providing a fast and secure payment method. By following this guide, you can integrate Google Pay seamlessly into your app. Always remember to test thoroughly and comply with Google’s policies and guidelines to ensure a smooth transaction process for your users.

 

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