get https://test.billing.gg/api/v1/orders//scheduled_payments/
To get a specific scheduled payment (billing event) for an order, enter the id (system identifier) of the order and the scheduled payment ID (SPID) of the billing event.
To display details of billing events in the UI, in an Order Summary go to the gear options menu, and select Payments. BillPro displays the Scheduled Payments pop-up with the SPID of each billing event.
Manage a billing event.