Not sure about other countries, but in the US, the Dodd-Frank Wall Street Reform and Consumer Protection Act (2011) ensures that merchants are allowed to offer

Not sure about other countries, but in the US, the Dodd-Frank Wall Street Reform and Consumer Protection Act (2011) ensures that merchants are allowed to offer cash discounts. > A PCN cannot stop you from offering your customers a discount or another incentive for using a certain method of payment, as long as you offer it to all your customers and disclose the offer clearly and conspicuously. For example, you can offer your customers a discount or a coupon if they pay with cash or a debit card rather than a credit card. https://www.ftc.gov/tips-advice/business-center/guidance/new-rules-electronic-payments-lower-costs-retailers https://www.ftc.gov/tips-advice/business-center/guidance/new...