Essentially, Apple. Goldman is getting their pay in transaction fees. Apple is hoping to increase the number of purchases made on Apple's products. You get cash

Essentially, Apple. Goldman is getting their pay in transaction fees. Apple is hoping to increase the number of purchases made on Apple's products. You get cash back on each transaction, Goldman gets a percentage of each transaction, Apple just loses a tiny bit of their profit on the sale, but they still made the sale. The only issue then is that debt collection is more expensive. The truth, however, is that most people pay their debts.