hi every buddy im currenlty writing a php script for loging in on yahoo messenger server with official yahoo messenger api. im using zend http client for connecting to yahoo api service server. im using all of standard parameters in http header to authenticate with oAuth service but every time i'll try to register a session with yahoo messenger server , server returns various error messeages. like : cookie error Code (markup): invalid signature Code (markup): and so on . any idea about this issue???