class OAuthClient

All requests are signed.
the access token. Then you can call OAuthClient#get, #post, #delete, etc.
and secret, oauth_config.token and oauth_token.secret are updated with
When the request succeeds and the server returns a pair of access token

verifier:: a verifier tag String.
request_token_secret:: a request secret String. See get_access_token.
request_token:: a request token String. See get_access_token.
uri:: URI for request token.
Get access token.

def get_access_token(uri, request_token, request_token_secret, verifier = nil)
  oauth_config.token = request_token
  oauth_config.secret = request_token_secret
  oauth_config.callback = nil
  oauth_config.verifier = verifier
  res = request(oauth_config.http_method, uri)
  filter_response(res)
  oauth_config.verifier = nil
  res
end