Thanks for the post.
I just used it on my mothers merchant account.
As in my bhim app, and my mom merchant account.
I did 3 transactions of 100 Rs. and 8 transactions of Rs 200/-. Here are the details
Got instant 100/- cashback in one of the bank accounts linked to BHIM.
1st and 2nd transaction went smoothly, and got immediate cashback.
for whatever reason in the third transaction while it was processing cashback, my screen dimmed because of my android display timeout setting and i got logged out of the app, and the cashback didnt process.
The 4th transaction i did of 200 Rs and it went through smoothly and i got 100/- cashback.
then i used an app that prevents my screen from sleeping and the next 5 transactions of Rs 200/- each went through smoothly and processed Rs 30/- cashback each. i tried one more transaction just to see if there was some bug and may be i could get some more cashback. lol. didnt get any cash back.
Beyond that i tried one more transaction of Rs 200/- using a different credit card, but again no cashback.
So all in all, the cashback ( 3x100/5x30) is on transactions on BHIM, and does not get reset on different credit cards ( as i was hoping. ) It all went through smoothly with zero hiccups. except for the third transaction.
Edit: i guess i should also mention that i scanned the Merchant UPI QR using my bhim app. Just in case if its relevant.