Lamarr and Anthiel received a patent in 1941, but the enormous significance of their invention was not realized until decades later. It was first implemented on naval ships during the Cuban Missile Crisis and subsequently emerged in numerous military applications.
Cash back credit card reward programs started out rather simply, offering a flat percentage rate (typically 1 percent of purchases) rebated back to the customer in the form of a check at the end of the year or a statement credit.
The cashier will ask for your signature or for you to enter your PIN. Use your card at the checkout and follow the prompts on the screen. There is no fee to get cash back with purchase at participating merchants. Enter the cash back amount on the keypad or tell the cashier the amount of cash you need.