https://api.mch.weixin.qq.com/v3/combine-transactions/jsapi [{"code":"SYSTEM_ERROR","message":"系统繁忙，请稍后重试"}] 合单商户号combine_mchid ，子单商户号mchid 是相同的么？

提交数据如下 { "combine_out_trade_no": "20220712184728", "combine_mchid": "1604977470", "combine_appid": "wx2b708d2c7d3d90ab", "scene_info": { "device_id": "POS1:123", "payer_client_ip": "183.6.118.97" }, "sub_orders": [{"mchid":"1604977470","attach":"\u88d5\u4e30","amount":{"total_amount":1,"currency":"CNY"},"out_trade_no":"fengpan_220220711144334","description":"\u6fc0\u6d3b\u4fdd\u8bc1\u91d1"},{"mchid":"1604977470","attach":"\u88d5\u4e30","amount":{"total_amount":1,"currency":"CNY"},"out_trade_no":"fengpan_220220711144300","description":"\u6fc0\u6d3b\u4fdd\u8bc1\u91d1"}], "combine_payer_info": { "openid": "oYSoxuP3Pbe093tGoInhuTYvVUY8" }, "time_start": 2022-07-13T18:47:28"+08:00", "time_expire": 2022-07-13T18:57:28"+08:00", "notify_url": "https://erp.yfdc.net/pay/example/notify.php" } {"code":"SYSTEM_ERROR","message":"系统繁忙，请稍后重试"}