API methods to manage Accounts/Users do not validate empty fields that are mandatory in CP. For example, account created with
AccountAdd_API may be created with empty city, e-mail, phone or other field. Users created with
UserAdd_API may be created without last name, city. etc.
This issue is caused by bug with id #PBA-10944 ("Account management API methods do not validate input parameters").
Data can be added later from control panel.