not sure about ipaymy but i'm using cardup and rental is included (as advertised).I've checked with iPayMy, their MCC code for any rentals are MCC 6513 which are under exclusion list in UOB One Card. So I suppose rent is not eligible if you use UOB One Card with iPayMy for rental expenses
in fact cardup is getting more 'friendly' with more and more features being accepted as eligible transactions based on their advertisement.
