Is the credit card tax rebate a scam?

1. My credit card is CITIC's all-currency credit card. When I swipe my card, do I swipe RMB at the real-time exchange rate or directly swipe Euro? Is it cost-effective to brush a domestic UnionPay card or a full-currency credit card?

Credit cards are still euros, but they are real-time settlement. According to the truth, you can receive a short message from the bank immediately, and how much RMB did you spend? It doesn't matter if you take master, visa or union. Renminbi bills Domestic UnionPay cards may not work in many places in Spain, but duty-free shops and airports can.