需求的场景描述

担保支付的流程是什么？

官方没有具体流程？

为什么下单一直报错？

下单内容：{"appid":"wxasss34ee2bc2","mch_id":"159ss76411","nonce_str":"79679d0acfcd4c7fb98df736bb0a625d","sign_type":"MD5","timestamp":"1645102238","version":"2.0","trade_type":"H5","payment_type":"direct","currency":"CNY","total_fee":"1","out_trade_no":"20220217125037556","uid":"70830941013384","subject":"字节测试支付","body":"字节测试支付","trade_time":"1645102238","valid_time":"300","notify_url":"https://wxapi.qzylnp.com/AppPay/DyNotify","sign":"E4F562430CDF6389D3420539BEAFC862"}

返回内容：

StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:

{

Connection: keep-alive

X-Tt-Logid: 202202171250370102081660491D8DE01C

X-TRANS-LEVEL: -1

Server-Timing: inner; dur=24, tt_agw; dur=22

Server-Timing: cdn-cache;desc=MISS,edge;dur=0,origin;dur=46

x-tt-trace-host: 01b62723b16f0713ca278847ebf414b177bad5ea80d8f70191e91ca7cde088de08d3e4f6ed723faeba5a06d3b0f4b23027cc697377f132309600cf9d210bb90ab14a8f25265dc4c1c8a85a4811e2379d9660d7f78351b277c76c5355be9c52321d

x-tt-trace-tag: id=3;cdn-cache=miss

X-TT-TIMESTAMP: 1645073437.832

x-alicdn-da-ups-status: endOs,0,400

Timing-Allow-Origin: *

EagleId: 1b80df1416450734377885066e

Date: Thu, 17 Feb 2022 04:50:37 GMT

Server: Tengine

Via: vcache10.cn2945[46,0]

Content-Length: 254

Content-Type: text/plain; charset=utf-8

}

希望提供的能力

具体下单流程，明确签名所用参数，下单地址。。。