Every LiveJournal XML-RPC request takes a common set of request parameters.

• String username - The username of user logging in.
• String auth_method - (optional) Authentication method used for this request. The default value is “clear”, for plain-text authentication. “cookie” and any of the challenge / response methods are also acceptable.
• String auth_challenge: If using challenge / response authentication, this should be the challenge that was issued to you by the server.
• String auth_response: If using challenge / response authentication, this should be the response hash that you generate, based on the formula required for your challenge.
• int ver: Protocol version supported by the client; assumed to be 0 if not specified.