protected function linkProvider($user_id, $provider, $provider_id, $access_token)
	{
		$user_provider = new Provider;
		$user_provider->user_id = $user_id;
		$user_provider->provider = strtolower($provider);
		$user_provider->provider_id = $provider_id;
		$user_provider->access_token = $access_token;
		$user_provider->save();
		
		return $user_provider;
	}