Merge branch 'ft-coupon'

# Conflicts:
#	src/Goods/Lib/GoodsInterface.php

src/Goods/Lib/GoodsInterface.php

@@ -209,4 +209,12 @@ interface GoodsInterface
 	 *               ]
 	 *               ]
 	 */
 	 */
 	public function addStock($storeId, $goods);
 	public function addStock($storeId, $goods);
+
+	/**
+	 * 计算商品价格
+	 * @param $storeId
+	 * @param $goods ['goodsId'=>num]
+	 * @return mixed
+	 */
+	public function sumGoodsPrice($storeId, $goods);
 }
 }