Does offering customers cashback save supermarkets money?

I learned recently that most supermarkets ask customers if they want any cashback not out of a desire to be helpful, but because the supermarkets get charged by their bank for paying in their own takings. So the more money given as cashback the less the supermarket has to pay into the bank, so less bank charges.... show more I learned recently that most supermarkets ask customers if they want any cashback not out of a desire to be helpful, but because the supermarkets get charged by their bank for paying in their own takings.
So the more money given as cashback the less the supermarket has to pay into the bank, so less bank charges. Is this correct?
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