Hello Nishit, thank you for your message, we are surprised you asking it as you were doing it before:)
The Pin also being entered while registering on the EN portal https://excellentnumbers.com/login.php?from=account.php%3Faction%3D and then customers can change it from their accounts same on admin I’m sure you know it.

Please also let us know what is the progress on Custom API works?
Cheers