This time, customers are choosy and demanding. If your business requires customers to pay in cash instantly, though that is always the case; other option includes paying through a credit card, therefore you must provide your customers with a credit card swiper. You might also have a long-time customer who wants to pay through installment, it is all up to you what to do with a case like that. But a case like that, there must be a counter assigned for installment payments. Your sales will surely flourish.