If you choose Millennia DC, my recommendation would be to utilize all three options to get reward points (with a cap of 400 points)...
- 1% for wallet load.
- 2.5% for (utility) bill payment (aka Canara Setu hack)
- 5% via smartbuy when you buy vouchers from Amazon / Flipkart, etc.
At some point, 2.5% via Canara Setu will go away in the future. So, please do not depend on it
entirely.
Also, smartbuy provides additional rewards in the name of promotional reward points (5%). So, it's actually 10%. 5% as regular reward points (with a cap of 400 per month). Another 5% as promotional reward points (with a higher cap, 2k, I think). Be warned about the hefty fee by smartbuy (nearly 4%). Even after a hefty fee, you'll end up with 6% discount on Amazon / Flipkart Vouchers.
Promotional points have an additional advantage... you can redeem as low as 1 reward point (equal to Rs.1).
For regular rewards, you can redeem only in multiples of 400.
If you don't understand any of the above points, please just re-read it multiple times. It just takes time to sink-in at times.