Google Pay - ERROR: Request Failed - Unexpected developer error, please try again later

Question

When I try to pay(on TEST environment) with Google Pay on a real device I get a the error in the title.

I have tried changing 'gateway' into a string like the google docs show it but so far nothing.

const DETAILS = {
id: 'COMPANY',
displayItems: [
  {
    label: 'Phone Bill',
    amount: { currency: 'USD', value: compTotal }
  }
],
total: {
  label: 'COMPANY',
  amount: { currency: 'USD', value: compTotal }
}
};

// GOOGLE PAY
const METHOD_DATA = [{
  supportedMethods: ['android-pay'],
  data: {
    supportedNetworks: ['visa', 'mastercard', 'amex'],
    currencyCode: 'USD',
    environment: 'TEST', // defaults to production
    paymentMethodTokenizationParameters: {
      tokenizationType: 'GATEWAY_TOKEN',
      parameters: {
        gateway: 'braintree',
        'braintree:tokenizationKey': 'sandbox_XXXXXXXXXXX'
      }
    }
  }
}];

const paymentRequest = new PaymentRequest(METHOD_DATA, DETAILS);

paymentRequest.show()
.then(paymentResponse => {
  const { getPaymentToken } = paymentResponse.details;

  return getPaymentToken()
    .then(paymentToken => {
      const { ephemeralPublicKey, encryptedMessage, tag } = paymentToken.details;

      return fetch('...', {
        method: 'POST',
        body: {
          ephemeralPublicKey,
          encryptedMessage,
          tag
        }
      })
      .then(res => res.json())
      .then(paymentResponse.complete('success'), handleConfirm())
      .catch(paymentResponse.complete('fail'), alert(1));
    });
});
};

Expected result would be the payment going through.

Answer 1

To learn more about this error, follow these steps:

1- Make sure Android Debug Bridge (adb) is installed on your computer.. Make sure USB debugging is enabled on your device. For more information, see Debug Your App.

2- Connect your phone to the computer with a USB cable.

3- Run the following command in a terminal or command prompt on your computer:

adb -d logcat -s WalletMerchantError