In the Paris boutique of a Swiss luxury watchmaker, a Chinese customer anxiously discusses a credit card payment with her bank. After hours of back and forth, it finally goes through – to everyone’s relief.“Things like this rarely happened before,” a salesperson at the store said, explaining how the card of the female customer was repeatedly declined as she tried to purchase a €25,000 (US$29,126) watch.The salesperson has also noticed a decline in spending by Chinese customers, ceding their...