API Endpoint to lookup user by filter, not search

[hwalker928]

Is there an existing feature request for this?

• [X] I have searched the existing issues before opening this feature request.

Describe the feature you would like to see.

Required to resolve the following issue: https://github.com/pterodactyl/whmcs/issues/151

Describe the solution you'd like.

Either modify the existing endpoint to filter instead of search, or create a new endpoint.

Additional context to this request.

No response