def get_access_token(oauth_verifier, request_token)
      params = {oauth_verifier: oauth_verifier}
      response = client(request_token.to_a).get_access_token(params)
      AccessToken.new(response[:oauth_token], response[:oauth_token_secret],
        response.reject { |key, value| [:oauth_token, :oauth_token_secret].include?(key) })
    end
def get_access_token(oauth_verifier, request_token)
      params = {oauth_verifier: oauth_verifier}
      response = client(request_token.to_a).get_access_token(params)
      AccessToken.new(response[:oauth_token], response[:oauth_token_secret],
        response.reject { |key, value| [:oauth_token, :oauth_token_secret].include?(key) })
    end
@param oauth_verifier [String] The code provided by Flickr after visiting
   the authorize URL.
 @param request_token [RequestToken, Array(String, String)]

 @return [Flickr::OAuth::AccessToken]