Google Pay

import { StripeProvider } from '@stripe/stripe-react-native';

function App() {
  const [publishableKey, setPublishableKey] = useState('');

  const fetchPublishableKey = async () => {
    const key = await fetchKey(); // fetch key from your server here
    setPublishableKey(key);
  };

  useEffect(() => {
    fetchPublishableKey();
  }, []);

  return (
    <StripeProvider
      publishableKey={publishableKey}
      merchantIdentifier="merchant.identifier" // required for Apple Pay
      urlScheme="your-url-scheme" // required for 3D Secure and bank redirects
    >
      // Your app code here
    </StripeProvider>
  );
}

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

import { usePlatformPay } from '@stripe/stripe-react-native';

function PaymentScreen() {
  const { isPlatformPaySupported } = usePlatformPay();

  React.useEffect(() => {
    (async function () {
      if (!(await isPlatformPaySupported({ googlePay: {testEnv: true} }))) {
        Alert.alert('Google Pay is not supported.');
        return;
      }
    })();
  }, []);

  ...

  return (
    <View >
      ...
    </View>
  );
}

import {PlatformPayButton, usePlatformPay} from '@stripe/stripe-react-native';

function PaymentScreen() {
  const {
    isPlatformPaySupported,
    confirmPlatformPayPayment,
  } = usePlatformPay();

  React.useEffect(() => {
    ... // see above
  }, []);

  const fetchPaymentIntentClientSecret = async () => {
    // Fetch payment intent created on the server, see above
    const response = await fetch(`${API_URL}/create-payment-intent`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        currency: 'usd',
      }),
    });
    const { clientSecret } = await response.json();

    return clientSecret;
  };

  const pay = async () => {
    const clientSecret = await fetchPaymentIntentClientSecret();

    const { error } = await confirmPlatformPayPayment(
      clientSecret,
      {
        googlePay: {
          testEnv: true,
          merchantName: 'My merchant name',
          merchantCountryCode: 'US',
          currencyCode: 'USD',
          billingAddressConfig: {
            format: PlatformPay.BillingAddressFormat.Full,
            isPhoneNumberRequired: true,
            isRequired: true,
          },
        },
      }
    );

    if (error) {
      Alert.alert(error.code, error.message);
      // Update UI to prompt user to retry payment (and possibly another payment method)
      return;
    }
    Alert.alert('Success', 'The payment was confirmed successfully.');
  };

  return (
    <View >
      <PlatformPayButton
        type={PlatformPay.ButtonType.Pay}
        onPress={pay}
        style={{
          width: '100%',
          height: 50,
        }}
      />
    </View>
  );
}