_delete($params, $opts); } /** * @param array|string|null $opts * * @return Coupon The saved coupon. */ public function save($opts = null) { return $this->_save($opts); } /** * @param array|null $params * @param array|string|null $opts * * @return Collection of Coupons */ public static function all($params = null, $opts = null) { return self::_all($params, $opts); } }