eCheck for $0 authorized

[ss57]

I just got the eCheck feature implemented correctly on our form. Saw an interesting thing on a transaction yesterday. The dollar amount was $0, but it came through as Authorized. Why should the system authorize a $0 transaction? Can this be changed or prevented?

[CnP.Support]

Good day!

To block $0 you need to block it at your form through validation. Please note that the $0 validation generates the Vault GUID for processing later. While credit cards generate a decline for $0 with the gateway, the ACH (eCheck) will verify and generate the ID for future transaction.

We can come up with validation but that puts us at odds with the behavior of the gateway / bank.

Please let us know if we can be of any further assistance.