How Much Interest Am I Paying on Processes Credit Cards?

What are these interest charges I see on my credit card processing report? There are two methods which a merchant processor charges interest on credit cards: 1) Three tier plus basis points 2) Interchange rates plus basis points There exist some 200 odd types of Visa/MasterCard credit cards which are issued by banks. An example of different types of Visa cards would be a Visa Gold Card compared with a Visa Rewards Card or a Frequent Flier mile Visa... [Read More...]