Enter the total amount for the check in the "Pay Exactly" box. Using only black ink, write in the numerical total of all items purchased on that specific check.ALL stores will provide at least 3 receipts for each. Read the agreement and all application questions before completing the application. Each retailer must stock a variety of WIC foods in the quantities and sizes specified in the Vendor. Agreement. • Stores must acquire additional quantities of. The vendor must have designated at a minimum, greater than fifty percent. Vendors may also call the state WIC office at 1-877-WIC-KIDS (942-5437) and ask to speak with a WIC vendor management representative. Single Grain Starter. The WIC client does NOT have to purchase all of the foods listed on the WIC check. x.