going to china soon, this 2pages info is useful enough. i think just require Alipay for all payment and also transport (in apps didi). and reload with bigpay. dont know why cannot reload with TNG wallet? alternate that ask friend to reload alipay then can transfer the RMB to friend using TNG wallet.

my problem solve after reading these info.
- get alipay apps register with malaysia phone and verfied.
- get roaming data and not retriction for all apps.
but 1 small problem still, from the comment above it cannot detect iphone location when using e hailing.

Didi is in Alipay mini apps. but not able to register food apps need local number. but also face some issue, since all the thing there will need wechat to scan n pay, but we dont have verify acc, like buying express bus to airport, indeed it need to scan and paid by wechat.

some entrance ticket also will require wechat scan n pay.

some restraunt will require scan order and pay (can use Alipay) but if you payment by card regardless CC or DC it will impose 3% charges.