Credit Cards
Credit Cards is a very convenient method of making purchases without carrying cash. This convenience has has caused their proliferation, and almost everyone has one.
The way a normal credit card works is that you make purchases using your card and the bank issuing the card will pay on your behalf to the merchant providing you the product or service.
The bank deducts a certain percentage (2.5% normally) from the merchant in return for processing the transaction and adding the money to the merchant's account.