Cashkaro is the best app to get cashback for applying Credit Cards. I have applied IDFC Wealth, HSBC Cashback & Airtel Axis and got it approved easily and around 5k+ in cashback 🙂. There is another application called KickCash which also gives cashback. So, check where you get better returns before applying. In my opinion CashKaro is better with good customer support and faster rewards tracking.