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Create an Apex Class to Process Payments
On the Apex Classes page in Setup, create an Apex class to facilitate payment processing.
When a customer makes a requested payment, this Apex class sends a payment token to the payment provider (WhatsApp Pay) so the payment can be processed. For more information on how to create an Apex class, see Create an Apex Class.
For details and an example, see ProcessPaymentHandler Interface and Sample Code Snippets for Apex Classes.
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