This endpoint generates a callback for subscription charges when a product purchase is created, regardless of success or failure. It requires a mandatory string payload containing the bt_signature and bt_payload parameters. To use subscriptions, configure the Braintree callback to direct to this endpoint.
OK. A product purchase is created successfully.
Bad Request. The product purchase creation failed because the subscription was overdue or the callback endpoint received an invalid or empty payload.
"bt_signature=<signature>&bt_payload=<payload>"