完成了课程模块的订单部分

src/main/java/com/greenorange/promotion/constant/OrderStatusConstant.java

@@ -0,0 +1,17 @@
+package com.greenorange.promotion.constant;
+
+/**
+ * 订单状态常量
+ */
+public interface OrderStatusConstant {
+
+    String CLOSED = "交易关闭";
+
+    String SUCCESS = "交易成功";
+
+    String PENDING = "待支付";
+
+    String REFUNDED = "已退款";
+
+
+}