protected function getPasswordCredential($credentials = array())
	{
		$passField = $this->app['config']['auth.credentials.password'];

		if (isset($credentials[$passField]))
		{
			return $credentials[$passField];
		}
		else if (Input::has($passField))
		{
			return Input::get($passField);
		}
		else if (isset($credentials['user_password']))
		{
			return $credentials['user_password'];
		}
		else if (isset($credentials['pwd']))
		{
			return $credentials['pwd'];
		}

		throw new InvalidArgumentException("Password field not found");

	}