Note Merchant Pay Limits — Big Purchases Need Card Backup — Sep 07

Note Merchant Pay Limits sounds like a micro-optimization until you are in a KTV room on Kehua Road where the AC wars are real.

A colleague from Brazil once ordered 'medium' spice and cried politely in front of coworkers. The fix took less time than telling the story.

Try this once: write the rule on your phone lock screen for three days. If it survives, it is yours.

Works for me in Chengdu humidity.