If you are being prompted for a PIN to pay your bill, you're trying to use a sign-in method that is not configured. From the Paying your Bill page (acu.edu/payingyourbill), students, faculty, and staff need to use the Wildcat Pay Portal link. The Authorized User link is for non-student, non-employee persons whom a student has designated as an Authorized User to make payments. The Authorized User portal does have a "Student and Staff" option that asks for a PIN, but it is not configured. Please return to the Paying your Bill page and use the Wildcat Pay Portal link.
