You are absolutely not allowed to only process transactions above a certain minimum or below a certain maximum value. Per regulations, if you are going to accept credit cards, you must accept them for any transaction.

You must truncate account numbers on your receipts. Each state has its own laws governing what can and can not be on the receipt. For both the Merchant’s and cardholder’s protection, the general rule of thumb is to print no more than the last four digits of the card number on the receipt.

Examine the card! There have been many cases of an expired card being presented for payment that gets a valid authorization from the processor. However, in the end the transaction is not paid to the Merchant. The Merchant is responsible for examining the card and verifying the information present on the card.

Take every measure possible to prevent duplicate transactions. Duplicate transactions will result in a credit, dispute or chargeback and all of these can add up to losing your Merchant Account.

Always get an authorization for every credit card transaction you are going to settle. Not doing so will only create headaches and lost revenue for you.

Merchants are not allowed to charge any sort of usage fee for credit card transactions to offset the cost of accepting credit cards. This was done many years ago, but has since been outlawed by the card networks. Your Discount Rate and other associated fess are simply a cost of business that you accept when you decide to accept credit cards.