post https://api-sandbox-v2.openkeys.8429y94d.hml.fsapps.app/open-keys/itp/api/v2/payment-initiation/callback
Handles OAuth2 authorization callback responses from account holder institutions after user consent. Processes authorization codes, ID tokens, and state parameters to complete the consent flow for payment initiation (PAYMENTS_V4), automatic payments (AUTOMATIC_PAYMENTS_V2), or enrollment-based payments (ENROLLMENTS_V2). This endpoint is called by the account holder after the user authorizes or rejects the consent request.