With most bank credit cards, you simply deposit in QuickBooks the amount
your customer has charged on the card. Your bank credits you with the total
amount charged. Then, in a separate transaction, usually monthly, the credit
card company charges you a fee based on the total charges for the month.
With American Express, you send your receipts to the credit card company via
an electronic terminal and they credit your bank account with your revenue
minus their charge. So a $100 American Express charge may show as only $98 in
your bank account.