...
As part of creating your account, we will authorize the account to make web service calls. Once this is activated, you are authorized to make any of the web service calls available on the WSDL. If you use web services on behalf of an end user (such as filing flight plans, performing briefings, etc.), the web user will need to log into our website and authorize you to make web service calls on their behalf. Without this authorization, you will get an error message in the web service response. To see how this authorization works, try it out in our lab environment.
For more information on how to make this work for you, go here: Service Provider Authorization.