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. Merchant Supply Orders Process by which merchants can order supplies for their credit card terminals. Nelnet Resources Information for U-M merchant’s using the ecommerce service Nelnet. Merchant Tip of the Month Promoting helpful tips, requirements, and other general information for merchants. Credit Card Terminals Tips and troubleshooting information for credit card terminals. EMV Information regarding new EMV security.