Currently GrabPay on Stripe can only be supported via
If you are already using the PaymentIntents API, you can start accepting GrabPay payments by adding 'grabpay' as a value passed in the payment_method_types parameter
GrabPay is not available via the Charges and Sources API. Please see below for relevant migration guides.
GrabPay-specific guide on Payment Intents
You will need the newest version of Checkout to support GrabPay. If you already using Stripe Checkout, you can start accepting GrabPay payments by adding 'grabpay' as a value passed to the payment_method_types parameter.
GrabPay does not work with the client-only integration of Checkout.
iOS and Android
Please refer to the GrabPay guide for the latest developments.