After you have downloaded the Enterprise or Partner WSDL, call the login() method to obtain a session ID from your org that you can use when calling CPQ Web Services. After authenticating, you can use the same session ID until it either expires or your logout or login again.

The example provided here uses SoapUI, an API testing tool which can be downloaded for free here: https://www.soapui.org/.

Prerequisite: To authenticate with Conga, please make sure to have your production or test org credentials on hand (username and password).