feat:优惠卷

src/Goods/Lib/GoodsInterface.php

@@ -186,4 +186,12 @@ interface GoodsInterface
 	 * @return array|mixed
 	 * @return array|mixed
 	 */
 	 */
 	public function find($storeId, $id);
 	public function find($storeId, $id);
+
+	/**
+	 * 计算商品价格
+	 * @param $storeId
+	 * @param $goods ['goodsId'=>num]
+	 * @return mixed
+	 */
+	public function sumGoodsPrice($storeId, $goods);
 }
 }