Deletes out payment

If the payment is not processed, it will be cancelled. </br> Get your strong authentication RSA private key from Easypay Backoffice on menu: </br> Web Services->Configuration API 2.0->Keys.

Required scope: <code style="background:#e8f0fe;color:#1a73e8;padding:2px 8px;border-radius:12px;font-size:0.85em">out_payment:delete</code>