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. Credit Card Terminal Receipt Paper Orders Instructions to order receipt paper for Worldpay credit card terminals. Credit Card Terminal Help Tips and troubleshooting information for credit card terminals. If you have access issues, please use the Chrome web browser. 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.