This is moderator from Samsung Members Community.
There're many reasons caused the terminal showing error.
If you receive a transaction error on the cashier's payment terminal, make sure there isn't an issue with your credit or debit card, such as insufficient funds.
Once the payment information is sent to the terminal, the transaction is now between the merchant and the card's network (i.e., Visa, MasterCard, or American Express). It is not the responsibility of Samsung Pay.
We would like to advise you check on this help content.
Please let us know if you have further enquiry.
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