There are so many UPI cards in the market now. Less from banks and more from fintechs.
Kiwi, KreditPe, Slice, Supermoney, Neu, Jupiter, and many more --> For all the fintech cards, you need to use their own specific apps. --> reward will be higher, but capped.
For bank cards, just get the rupay variant of your existing card and add to any UPI app --> but reward will be low.