add custom field to client login page

[mehdi-eybak]

Hi, I am a developer and I am coding a module. The problem I have and I have been dealing with it for a few days is that I want to add a custom field to the login page of the whmcs client. I searched that it is possible to add the field through the management panel, but I want to add a custom field by coding. For example, the field Mobile number. I did not find the code in the document. Thank you for guiding me.

[jason200434]

May I ask why you would want to add a custom field to the login page, to begin with?