Looking at posonline list of payees https://www.posonline.com.my/ecommerce/New1/PaymentList.asp

I can see got Unifi. Getting charged 2.12% (2% plus 6% on the charge) is okay if you don't have better cashback for unifi.

I applied VOX but rejected, so currently I can't really get cashback for unifi unless using AEON Watami. In any case, based on hafizhans report I will test with RM50 payment first, see if really can kena 5%. Report end of the month la =)

EDIT: Oops minimum RM50, will test that

EDIT2:
Basic maths
Bill: RM50
Payment: RM51.06
Cashback: RM51.06 * 0.05 = RM2.55
Effective cashback: RM2.55 - RM1.06 = RM1.49
Effective cashback percentage: RM1.49 / RM50 = 2.98%

Still more worth it to use Watami unless I already maxed that out. Nvm will try, I think I will sure max Watami soon anyway.