Update the Username/Password for a Client. 

Returns a TAuthenticate object. 

Proposed new Username and Password are passed as parameters. Username must be unique, otherwise the update does not occur. If a password policy has been configured in VETtrak, the new password must meet the policy rules. 

A token is passed for authentication. If the authentication fails, or other errors occur, no client details are updated. The result of the authentication and update is represented by a TAuthenticate object. 

This function has security level "Restricted". Users that have explicitly been granted permission to the API can use it with any parameters, otherwise, the logged-in client can only access their own data.

[WebMethod(Description = "Updates the username and password of the client with the specified code to the username and password specified")]
public TAuthenticate UpdateClientUsernamePassword(string sToken, string sClie_Code, string sUsername, string sPassword);