A 64014 Error is an indication that the provided paymentMethod attribute "ach-debit" was used, but the AVSName Parameter was not found inside the verb.
Electronic Check Processing requires a name.
Make sure a "AVSName" Parameter element exists inside the verb.
Example:
1<Pay paymentMethod="ach-debit" ...>2<Parameter name="AVSName" value="john smith" />3</Pay