You want to buy goods – on credit. You first need a revolving credit from the seller. Or maybe you`re selling items and are willing to lend to trustworthy buyers. You must get the promise in writing. A revolving credit agreement sets out the terms of the credit. Not all credits require piles of paperwork. A revolving credit agreement is quite simple and often only exists between a single seller or store and a customer. Maybe the customer regularly makes big purchases. Or maybe the customer owns a small business, but their check writing process takes a few days.