update tmall order producer

backend/app/Platform/Tmall/Producer/TmallOrderProducer.php

@@ -13,4 +13,21 @@ class TmallOrderProducer extends OrderProducer
     # @attention 注解的配置不会在直接 new 实例化时自动应用到对象属性上
     protected string $exchange = 'tmall.exchange';
     protected string|array $routingKey = 'order.tmall';
+
+    /**
+     * 构建消息格式
+     *
+     * @param array $data 原始订单数据
+     * @return array
+     */
+ 
+    protected function buildMessage(array $data): array
+    {
+        // 根据 RabbitMQ.md 中定义的消息格式规范
+        $parent_meta = parent::buildMessage($data);
+        $parent_meta['platform'] = 'tmall';
+        $parent_meta['meta']['source_system'] = 'tmall_api';
+
+        return $parent_meta;
+    }
 };