Here's where you can find your UPI ID on different UPI apps:
1) GOOGLE PAY
Open Google Pay
In the top right, tap your profile photo.
Tap on 'Bank accounts'.
Tap the bank account whose UPI ID you want to view.
You will find the associated UPI ID under 'UPI IDs'.
2) BHIM APP
Open the BHIM app.
Click on 'Profile' on the homepage
You will find the UPI here. It will be your registeredmobilenumber@upi.
Open the Paytm app.
Click on the 'BHIM UPI' section at the topmost bar on the homepage.
You will find your UPI ID in the first section of the page along with QR code. The UPI ID will be your phonenumber@paytm (as mentioned above).
4) PHONE PE
Open the PhonePe app.
In the top left corner, tap on your profile picture
Click on 'MY BHIM UPI ID' and you will find your unique ID. It will be your phonenumber@ybl.
Open the Mobikwik app.
Tap the bank account whose UPI ID you want to view, at the top right corner. The UPI ID will yourmobilenumber@ikwik