How to Start Accepting Credit Cards Information for U-M units/departments who wish to accept credit cards. Merchant Forms & Policies Policy documents and change/registration forms for U-M Merchants accepting Credit Cards PCI Resources PCI Compliance is a critical and mandatory aspect of securely accepting credit cards. Bluefin Pax A80 FAQ FAQ's related to Bluefin Pax A80 terminals Merchant News & Tips of the Month Promoting helpful tips, requirements, and other general information for merchants. Nelnet Resources Information for U-M merchant’s using the ecommerce service Nelnet. EMV Information regarding EMV security.