GooglePay - Direct API Integration

This document describes the integration steps for Google Pay using the pure API model.

Under the pure API integration model, merchants must build their own payment interfaces, such as the checkout page and payment results page. Furthermore, merchants must perform complex certificate configuration and encryption and decryption. Therefore, this model requires merchants to invest more in R&D costs.

For more information about the pure API integration model, please see the Integration Mode Overview.

1. Interaction Process

2. Integration Steps

Merchants must first obtain a Google Pay Token, decrypt the token to obtain the card information, and then pass the decrypted card information to PayerMax.

For more information on Google Pay payment requests, please refer to: Google Pay Object Reference.

Note:

If merchants have already integrated Google Pay at their checkout, they can proceed directly to step 2.2.

2.1 Integrating Google Pay

For information on integrating Google Pay, please first refer to the Google Pay API Guide.

2.1.1 Configuring a Google Pay Merchant Account

1. Register for the Google Pay Business Console;

2. Obtain core parameters:

• merchantId - Google Merchant ID

• paymentGatewayId - Payment Gateway ID

3. Generate a decryption key:

# Generate an ECDSA key pair
openssl ecparam -genkey -name prime256v1 -noout -out google_pay_private.pem
openssl ec -in google_pay_private.pem -pubout -out google_pay_public.pem

2.1.2 Client-Side Integration with Google Pay

The server provides payment configuration parameters for the client to initialize Google Pay.

const paymentsClient = new google.payments.api.PaymentsClient({
  environment: 'PRODUCTION' // or 'TEST'
});

const paymentDataRequest = {
  apiVersion: 2,
  apiVersionMinor: 0,
  merchantInfo: {
    merchantId: 'YOUR_GOOGLE_MERCHANT_ID',
    merchantName: 'Your Store Name'
  },
  allowedPaymentMethods: [{
    type: 'CARD',
    parameters: {
      allowedAuthMethods: ['PAN_ONLY', 'CRYPTOGRAM_3DS'],
      allowedCardNetworks: ['VISA', 'MASTERCARD', 'AMEX']
    },
    tokenizationSpecification: {
      type: 'PAYMENT_GATEWAY',
      parameters: {
        'gateway': 'companyA',
        'gatewayMerchantId': 'YOUR_COMPANY_A_MID'
      }
    }
  }],
  transactionInfo: {
    totalPrice: '99.99',
    totalPriceStatus: 'FINAL',
    currencyCode: 'USD'
  }
};

paymentsClient.loadPaymentData(paymentDataRequest)
  .then(paymentData => {
    // Get an encrypted token
    const token = paymentData.paymentMethodData.tokenizationData.token;
    // Sent to the merchant server
    sendToServer({ googlePayToken: token });
  })
  .catch(err => console.error(err));

2.1.3 Decrypting the Payment Token on the Server

• The client returns the payment token paymentMethodData;

• Decrypt the token on the server. For details, please refer to: How to decrypt the payment method token.

2.2 Calling PayerMax for Payment

Create payment/orderAndPay API interface request, where the key fields are:

• paymentDetail.paymentMethodType: GOOGLEPAY

• paymentDetail.googlePayDetails: Decrypted payment information

API request example:

Pass the decrypted Card Information from the GooglePay Token to the data.paymentDetail.googlePayDetails field.

{
  "version": "1.4",
  "keyVersion": "1",
  "requestTime": "2022-02-25T09:23:06.473+00:00",
  "appId": "6666c8b036a24579974497c2f9800001",
  "merchantNo": "020213834421284",
  "data": {
    "outTradeNo": "Test1645780876511",
    "subject": "this is subject",
    "totalAmount": 1,
    "currency": "AED",
    "country": "AE",
    "userId": "userId001",
    "integrate": "Direct_Payment",
    "expireTime": "1800",
    "paymentDetail": {
      "paymentMethodType": "GOOGLEPAY",
      "buyerInfo": {
        "firstName": "James",
        "lastName": "Smith",
        "phoneNo": "903124360628",
        "email": "james@google.com",
        "clientIp": "124.156.108.193",
        "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36"
      },
      "googlePayDetails": {
        "authMethod": "CRYPTOGRAM_3DS",
        "cardHolderFullName": "cryptogram googlePayDetails cardHolderFullName",
        "cardNetwork": "VISA",
        "expirationMonth": "01",
        "expirationYear": "2029",
        "pan": "3604241234569621",
        "description": ""
    },
    "goodsDetails": [
      {
        "goodsId": "D002",
        "goodsName": "Key buckle",
        "quantity": "2",
        "price": "0.5",
        "goodsCurrency": "AED",
        "showUrl": "http://ttt.com",
        "goodsCategory": "电脑"
      }
    ],
    "shippingInfo": {
      "firstName": "James",
      "lastName": "Smith",
      "phoneNo": "903124360628",
      "email": "James@google.com",
      "address1": "GOLGELI SOKAK NO.34, 06700",
      "city": "GAZIOSMANPASA/ANKAR",
      "country": "TR",
      "zipCode": "06700"
    },
    "billingInfo": {
      "firstName": "James",
      "lastName": "Smith",
      "phoneNo": "903124360628",
      "email": "James@google.com",
      "address1": "GOLGELI SOKAK NO.34, 06700",
      "city": "GAZIOSMANPASA/ANKAR",
      "country": "TR",
      "zipCode": "06700"
    },
    "riskParams": {
      "registerName": "lily",
      "regTime": "2023-07-01 12:08:34",
      "liveCountry": "VN",
      "payerAccount": "987654XXX",
      "payerName": "lily",
      "taxId": "1234567890"
    },
    "language": "en",
    "reference": "020213827524152",
    "terminalType": "WAP",
    "frontCallbackUrl": "https://xxx.com",
    "notifyUrl": "https://yyy.com"
  }
}

Interface response example:

{
  "code": "APPLY_SUCCESS",
  "msg": " Success.",
  "data": {
    "outTradeNo": "a1234934974321",
    "tradeToken": "T2025051210335071234567",
    "status": "SUCCESS"
  }
}