Frankly speaking, No. This app is there only to get card details, mobile numbers linked of users and data collection, mining and then selling data to other data hoggers. That's why I never used any TPA. For a meagre amount of money can't sell my data here and there.I made a 3 consecutive payments(100, 5k, 4k) and surprisingly all are successful. Is this app legal?
For me any app from banks itself or Govt is a good to go although Govt servers are more prone to leaks than banks. Atleast there is accountability from both of them. But these apps come and without notice close down at will.