cashback
noun [ U ]
UK (also cash-back) uk/ˈkæʃbæk/ us MARKETING, COMMERCE
an amount of money someone receives when they buy something, offered by the company selling the product as a way of persuading people to buy it:
The mortgage deal includes £250 cashback.
BANKING, COMMERCE
a way of getting cash from a supermarket instead of going to a bank. You pay for the cash and your goods using a debit card (= a bank card where the money is taken from your account immediately):
I'd like £50 cashback please.