Assuming no server failures,the reason MAY be minimum amount payable and payable amounts are same. could you try with the minimum amount (mam) below 1500. Note: You can do away with mam as it’s an option parameter
Is your problem resolved now?
I am also trying to intgerate UPI based payment in my mobile app using deep linking. It is working correctly with Axis-PAy app. But not working with HDFC mobile banking app. I would love to know if you could successfully deal with it.