Submitting on behalf of two Aeon libraries: One library uses Authorize.net. They need to designate a specific activity code so that the funds paid by the patron are directed to the correct department. The activity code could be entered by the staff person in an Aeon field - perhaps as a type of billing default - and then included with the information that is sent to the billing gateway vendor.

The second library uses PayPal. The entire institution uses one account, and so something like the above scenario would help where the staff person could designate a specific funding code that would "stick" with the payment submitted by the patron.