There is provision to add upto five web urls within the softphone. These could be used as tutorial links with different sections. Alternatively the url could link to a billing page on the Provider's website to allow users to add credit to their account. Credentials can be passed with the url by specifying as below
https://yourserver.com/billing?username=%user%&password=%pwd%
The %user% and %pwd% placeholders will be substituted for the actual username and password and sent to the webservice to authenticate the user. There is the option in the portal to choose whether SIP account credentials are used or credentials used for provisioning. If SIP account credentials are selected it would always be the current active SIP account on the softphone.