Apay /Shopping vouchers Need help Urgent!!!!!!!!!!!!!!!!!!!!!!!!

I used to buy Apay and other shopping vouchers using Ishop but now it is devalued what is the best alternative for buying shopping vouchers? the Cards i have are

ICICI Times black

Axis atlas

scapia

regalia gold

Equitas power miles

Yes bank Kiwi

. What is the best card to use and where to buy vouchers for best returns???