This document is a vendor training guide for the Women, Infants, and Children (WIC) Nutrition Program in Maine. The guide provides information on the purpose of the WIC program, how to contact WIC, the role of a WIC vendor, WIC food categories and approved food list, the WICShopper app, minimum stocking requirements, authorized infant formula suppliers, price survey and maximum allowable reimbursement, eWIC transaction flow overview, at the cash register, at the cash register (continued), other important WIC sale information, issues at the cash register, reporting a WIC customer issue, troubleshooting transactions, employee training, vendor agreements, vendor sanction system, appealing an adverse action, claims against vendors, record keeping requirements, things to report to WIC, and what's new in the WIC program.