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    // Get an instance of the Google Payments Client.
    getGooglePaymentsClient()
      // Load the payment data in console for the transaction.
      .loadPaymentData(req)
      // If the payment is successful, process the payment
      .then(function (res) {
        // show returned data for debugging
        console.log(res);
        // @note DO NOT save the payment credentials for future transactions,
        // unless they're used for merchant-initiated transactions with user
        // consent in place.
        const gatewayReq = getPayrixGatewayRequestData({
          gatewayMerchantId: payrixTokenizationSpecification.parameters.gatewayMerchantId,
          totalPrice: req.transactionInfo.totalPrice,
          paymentDataResponse: res
        });

        return fetch('{{your_payrix_gateway_url}}', {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json; charset=UTF-8',
            'APIKEY': '{{your_payrix_gateway_apikey}}',
          },
          body: JSON.stringify(gatewayReq),
        });
      })
      .then(function (gatewayRes) {
        if (!gatewayRes.ok) {
          throw new Error(`Payrix gateway response status: ${gatewayRes.status}`);
        }
        return gatewayRes.json();
      })
      .then(function (gatewayResJson) {
        if (gatewayResJson.errors && gatewayResJson.errors.length > 0) {
          throw new Error(`Payrix gateway response errors: ${gatewayResJson.errors}`);
        }
        // payment gateway authorizes payment
        console.log(gatewayResJson);
      })
      // If there is an error, log it to the console.
      .catch(console.error);