GrabPay Payments

GrabPay is an e-wallet, which is part of the Grab super app used in Singapore that allows payers to purchase using their Grab account. GrabPay is a supported browser payment method in the Mastercard Payment Gateway. This page describes integration details specific to GrabPay.

It is recommended that you read the integration guidelines for browser payments, before building the GrabPay integration.

GrabPay browser payments are only supported for transactions in the SGD (Singapore Dollar) currency.

Prerequisites

To offer GrabPay as a payment method via the Mastercard Payment Gateway:

  • you must be registered with your browser payments service provider
  • your merchant profile on the gateway must be configured using the details of your account with the browser payments service provider, and
  • you must have a bank account in one of the supported currencies registered against your merchant account at your browser payments service provider.

GrabPay Integration

GrabPay via Hosted Checkout

Hosted Checkout integration allows you to collect payment details from your payer through an interaction that the gateway hosts and displays.

From the API version 64 onward, GrabPay is automatically available as a payment method once your payment service provider enables and configures you for this payment method.

GrabPay via Direct Payment

Direct Payment integration allows you to offer GrabPay payment method on your own checkout page.

GrabPay is supported from API version 62 onward.

In addition to the standard fields required in a browser payment request, provide the following fields in the Initiate Browser Payment request:

Common Fields

  • sourceOfFunds.type = GRABPAY
  • browserPayment.operation = PAY
  • sourceOfFunds.provided.grabPay.accountHolder: Name of the GrabPay account holder.

Preferred Language

You can set the language that you prefer GrabPay to use for pages displayed to the payer by providing the browserPayment.preferredLanguage field in the Initiate Browser Payment request. However, the language will be used only if GrabPay supports it.

Sample Code to Initiate GrabPay Payment
{
   "apiOperation":"INITIATE_BROWSER_PAYMENT",
   "browserPayment":{
      "operation":"PAY",
      "returnUrl":"<your_merchant_URL>"
   },
   "order":{
      "amount":"10.00",
      "currency":"SGD"
   },
   "sourceOfFunds":{
      "type":"GRABPAY",
      "provided":{
      "grabPay":{
        "accountHolder":"George Smith"
        }
      }
   }
}

How to Interpret the Transaction Result

The table shows the transaction response codes for the possible scenarios you may encounter after initiating the GrabPay payment.

Initiate Browser Payment Response What This Means...
response.gatewayCode=SUBMITTED
result=SUCCESS		 Redirect the payer using the URL provided in the response.
Retrieve Transaction/Retrieve Order Response What This Means...
response.gatewayCode=APPROVED
result=SUCCESS		 The payment is successful.
response.gatewayCode=PENDING
result=PENDING		 The Mastercard Payment Gateway is waiting for a notification from the acquirer about the payment result. Try RETRIEVE_TRANSACTION again later or listen to notifications from the Mastercard Payment Gateway.
response.gatewayCode=CANCELLED
result=FAILURE		 The payer has canceled the interaction for this payment. Offer the payer the option to try another payment method.
response.gatewayCode=DECLINED or ACQUIRER_SYSTEM_ERROR
result=FAILURE		 The payment was declined. Offer the payer the option to try another payment method. In the case of an ACQUIRER_SYSTEM_ERROR you may want to inquire with the acquirer the reason for payment failure, or you can try RETRIEVE_TRANSACTION again.
response.gatewayCode=TIMED_OUT
result=FAILURE		 Treat this as a declined payment. The Mastercard Payment Gateway will make an attempt to ensure the transaction is not successful or will revert the transaction.

Refunds

You can refund GrabPay payments in part or in full. You must be configured for refunds on the Mastercard Payment Gateway and on your merchant account at your browser payments service provider.

Testing Your Integration

The Mastercard Payment Gateway provides a browser payments emulator that allows you to test your GrabPay integration.

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