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Create an Apex Class to Process Payments Status
On the Apex Classes page in Setup, create an Apex class to facilitate payment status processing.
When a customer makes a requested payment, the payment status is sent back to this Apex class so that the status can be used for further processing. For example, you can use the status for sending notifications, inventory management, order tracking, and so on. For more information on how to create an Apex class, see Create an Apex Class.
For details and an example, see ProcessPaymentStatusHandler Interface and Sample Code Snippets for Apex Classes.

