Failed to validate oauth signature and token


#1

Hi,
I am getting this message each time i try to get access token.I am using the following url
https://api.twitter.com/oauth/request_token?oauth_callback=(Redirect_url)&oauth_consumer_key=consumer_key"
Please tell me the correct method and url to hit the so as to get the access token.
Thank you,
AnandaKrishna S