Actually m using Microsoft Lumia 540 Os windows 8.1 In this Phone Paytm don’t work and many I verify my mobile number but they don;t verify my no they just send me OTP code when m write the code after min app is close automatic may be it work in android Phone BUT in my phone their are to many problems not even my phone entire Microsoft series. my only concern is that if your app is don’t work on windows Phone then why you are providing this app to user this is completely wrong if your app is perfect then you should provide to customer.