post
https://api.prahsys.com/payments/n1/merchant//order//pay-schedule/start
Activates the pay schedule for an order. The order must already have pay schedule data configured (via the Update or Create Order endpoint) but not yet started.
For non-autopay schedules: Creates the first pay period and sends an invoice to the customer via their configured notification preferences (email/SMS).
For autopay schedules: Processes the first payment immediately using the stored or provided payment method,
then creates the next pay period. A session can be provided to tokenize a new payment method.