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To give discounts for cash or for the payment processors to charge above 0% from the sellers?
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A discount for cash is the same as an extra fee on cards.

https://europa.eu/youreurope/business/finance-and-tax/making...

(Yes, I know UK isn’t in EU anymore but pretty sure their rule is legacy from EU)

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Id guess the discrimination itself between these two things and putting it in a contract?
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