delete https://sandbox.finmid.com/api/v2/b2b-payments/buyers/
For deleting an existing buyer, you'll only need the buyer's ID specified on creation.
Buyers are not deleted instantly but rather marked for deletion. Any open transactions/ payments prevent deletion of the buyer until they are completed. If a buyer is marked for deletion, no further transactions are possible with this buyer, and the buyer will be deleted automatically once all open transactions/ payments are completed.