When travel to china, bring every debit and credit card you have because there is no such thing as a one card for all, your card or account will eventually got blocked and ask you to call the number behind your card
But Malaysians bank are inconsiderate and stupid to never thought that people can't call when they're overseas

And avoid roaming as much as possible in china because the app you're using is monitoring what IP address youre using and will kick you out of the app and block you and ask you to call their customer service

like i said, it's never about the app or what bank/what card u use

try scan 15-20+ transaction per day and see what happens tomorrow, suddenly you'll realize your card got blocked or being limited use
i also scan like 20 transaction on the 1st day, the next day i'm limited to 5 transaction a day and thn ultimately the bank block the card completely after i lodge a complaint with the bank

because i also understand that's not our our card works for the rest of the world, we only use it for meal and big priced items...max also 5 transaction per day
but not in china where everything is 1 transaction no matter how small the amount is.....so the transaction accumulates and the system will flag as unusual activity

at the end, i had to lodge a formal online complaint with BNM to get the card to unblock because the bank ignore me completely