post https://{domain}:{port}/api/Cortina//start
This method starts every transaction flow and informs Nayax that a consumer has been approached to an operator's machine.
This method is called by the Integrator and provides Nayax with a transaction Id (Generated by the integrator and binds all Nayax-Integrator communication regarding a certain transaction),
AppUserID, TerminalId, secret token, and App account balance.
The request should be sent to the following address:
https://lynx.nayax.com/payment/v2/transactions/cortina/(integrator's payment method name)/start