Connecting to Akixi API using Power Query

Thank you for this. I've been readin through the link but I can't see anything about where you have to create a session first. For this API I need to create the sessionID and then pass this through as a JSESSION cookie to the login step where I can use the appropriate authentication method. Are you able to give an example code of how I would create the session and obtain the session ID token to then pass into the login step.