Four properties, and between them they explain every difference between an advance and every other way of funding a business.
An advance provides money now in exchange for a specified amount of the card receipts the business will take later. It is a purchase rather than a loan, and almost everything that surprises merchants about these arrangements follows from that one fact.
Written down like that it sounds like a technicality. It is not. It changes how the cost is expressed, whether the cost can fall, when the arrangement ends, and what happens in a month when the sales do not arrive — which are the four things anybody signing one needs to have understood in advance.
Availability, amounts, the share remitted and the cost are decided at review and differ between businesses. No approval, amount, share, cost or timeframe is promised on this page, and nothing here is an offer of credit or of financing.