post https://sandbox.trustly.one/api/v1/transactions//feedback
This endpoint updates the status of a user by posting feedback data to Trustly for an authorized Identity transaction. This communicates to Trustly that the user associated with the transaction has been successfully registered in the merchant system, or that the user record has been voided and therefore will not be eligible for future payment transactions.
To confirm a user was registered, set properties status to 4, subStatus to 559 and description to Registered. To void a user who did not complete registration after completing the Trustly ID flow, set status to 13, subStatus to 558 and description to Known bad user.
See the Trustly ID tutorial for more details.