If you don't know how to create UPI then please check below video to create paytm UPI https://www.youtube.com/watch?v=6gtU4_Y28mY Note: we don't pay via Paytm wallet/Phone.pe wallet/Tez wallet so, you need to update your Paytm UPI/Phone.pe UPI/Tez UPI instead of paytm wallet number.

Note: UPI looks like 12542222212a@paytm or 12542222212a@oksbi etc.