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how to put a note or notice of additional charge for card payment
In El Salvador, an additional 10% is charged if you pay with a credit or debit card for the use of pos, if you pay in cash there is no additional charge. Where and how can I put this so that the client knows it from the reservation?
Card payments are never effected by country.
Card fee is only applied by a payment gateway provider.
Instead factor it into your rate, keep it simple dont overthink it.