How does retail shops redeem their credit sales?

How does retail shops redeem their credit sales?
Added (1). Just wanted to know the scenario. Is it something like the person will personally go to their bank and produce these receipts which the bank will accept and credit their bank account?

Suppose I buy $20 worth of stuff from a grocery store using my credit card. When does the seller actually gets the cash?

Thanks

Read more: How does retail shops redeem their credit sales?