Are there any hacks to maximize NETS payment?

For smaller merchant or SME, they offer payment method in cash or nets. I assume NETS offer the lowest transaction fee to merchant among Singapore payment gateway.

I understand that we can use a bank ATM card as NETS payment and earn a bit of cash back.

Like to gather some suggestion from all the experts in Seedly, how do you maximise your cash back or reward with NETS payment? Any hack?