put
https://sandbox-api.lemonway.fr/mb/ENV-NAME/directkitrest/v2/moneyouts/iban//unregister
The UnregisterIBAN method enables you to disable an IBAN from a Payment Account. As a reminder a bank account number (IBAN) is needed to process Money-Out. An IBAN is not needed to perform Money-In on a Payment Account or Peer to Peer transfers between Payments Accounts.