The option to register a licensed FaxMaker user as a Web Service API user is not offered.
GFI FaxMaker 2013 build 20131008 and later
All Supported Environments
Either select another licensed GFI FaxMaker user from the list who is not a fax administrator or create a new licensed FaxMaker user for WSAPI.
Fax administrators cannot be registered as Web Service API user.