更新bill服务接口

src/Buyer/Enum/BillEnum.php

+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2018/8/31
+ * Time: 17:25
+ */
+namespace Hdll\Services\Buyer\Enum;
+
+class BillEnum
+{
+    const STATE_BALANCE_FALSE = 1; //未入账
+
+    const STATE_BALANCE_TRUE = 2; //已入账
+}
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