You guys are lucky, there is very little cashback on this, 0.50% on UPI and 1% for online.
Because for cashback pop coins are valued at 10 paisa.
If you buy some vouchers (not Amazon, Flipkart) you will get 25 paisa value for pop coins, so then returns are 1.25% on UPI and 2.5% on online.
But for 10% online and 5% UPI returns, you need to use pop coins as a discount to buy over priced cheap quality products, which cannot be returned