Sign the Entity Credit Card Acceptance Agreement. A sales tax exemption certificate is available from the Purchasing Agent.Card users shall give the sales tax exemption form to vendors when purchases are made. A complete break down of credit card surcharging laws in all 50 states. Looking for the best payment and credit card processing company in Salt Lake City, Utah? Generate, fill in, and complete now. Purchase for payment and reconcile the transaction in the P-card Portal. Thanks to card readers, transactions can now be verified instantly. All you have to do is swipe or tap your card and the purchase is made.