On the Premium Portal, Add Toggle for Payment Type Code for ACH Prenotes

Currently, premium portal WEB ACHs are denoting Prenote transactions with payment type code "PN" - this is not a standard code and is causing issues with client banking systems failing to validate the ACH file.

We changed the payment type code to "PN" for Producers Coop - to keep them working, this needs to be done as a setting/toggle/parameter somewhere.

On = change code to PN

Off = set it back to whatever we had originally (probably "R" or "S")