Users on WooCommerce can refer to this custom plug-in to start setting up GrabPay.

Other partners like Shopify, WIX, Xero, and OpenCart don't have official integrations with Stripe for accepting GrabPay charges. Please check directly with these platforms to find out if they currently support GrabPay, as they may have official plugins or third-party integrations that allow their users to integrate with various payment methods.