收付通合单小程序下单，老师们来帮我看看提交的JSON格式哪里错了？一直返回下单“系统繁忙，请稍后重”
{
"combine_appid": "wxaxxxxx1a55",
"combine_mchid": "1643xxx",
"combine_out_trade_no": "P10150",
"sub_orders": [{
"mchid": "1648251039",
"attach": "xxxxx",
"amount": {
"total_amount": 1224,
"currency": "CNY"
},
"out_trade_no": "10368",
"sub_mchid": "1648251039",
"description": "平台商品",
"settle_info": {
"profit_sharing": true,
"subsidy_amount": 0
}
}],
"combine_payer_info": {
"openid": "o4msxxbZ-Qxxxg3tL_WvEqk"
},
"time_start": "2023-07-28T17:19:45+08:00",
"time_expire": "2023-07-28T17:24:45+08:00",
"notify_url": "https://www.xxxxx.com.cn/admin/xxxx/notify.php"
}
