1、介绍
文档地址：
https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/ecommerce/combine/chapter3_7.shtml
用户支付完成后，微信会把相关支付结果和用户信息发送给清算机构，清算机构需要接收处理后返回应答成功，然后继续给异步通知到下游从业机构。
对后台通知交互时，如果微信收到应答不是成功或超时，微信认为通知失败，微信会通过一定的策略定期重新发起通知，尽可能提高通知的成功率，但微信不保证通知最终能成功。（通知频率为15s/15s/30s/3m/10m/20m/30m/30m/30m/60m/3h/3h/3h/6h/6h - 总计 24h4m）
注意：同样的通知可能会多次发送给商户系统。商户系统必须能够正确处理重复的通知。
2、对通知数据进行解密
代码语言：javascript复制String result = new String(outSteam.toByteArray(), StandardCharsets.UTF_8);// 获取微信调用我们notify_url的返回信息
System.out.println("微信支付回调返回参数result：=====" result);
JSONObject json = JSONObject.parseObject(result);
System.out.println("微信支付回调返回参数json：=====" json);
JSONObject resourceRes = json.getJSONObject("resource");
System.out.println("微信支付回调返回参数resourceRes：=====" resourceRes);
AesUtils aesUtil = new AesUtils("APIv3密钥".getBytes(StandardCharsets.UTF_8));3、结果
代码语言：javascript复制微信支付回调返回参数json：====={"summary":"支付成功","event_type":"TRANSACTION.SUCCESS","create_time":"2020-03-24T18:07:42 08:00","resource":{"associated_data":"transaction","ciphertext":"6XMaa17DRH9uKYuRJneC3wy6ihGiPquKGaCsCScBtxxMY5PLHEeLPl3kBgH/Yes FOrLh92zsbQa85OIAtnc7eqlLpWb1uiP3jJhglmjzul35WK naUsxzKLDgUFnUcyfV1PTM287QEFRIC jvbwHK82lpELOEUCnBx0/ompQM3fzxWQczlw3CvPWTciSgy8XUqui5owvXxkbrKwruIEfigY/LOByXW0w26jX7hEKLjAghdD1NvIgFhkKf3MkbGduNiDsTn1V5z9hzoWR2MwJI/NZFRpsdr9QmxkSiGwf0FzqnOhCLsjntXAKru89CsdWyfznl2BRdbBYF 4ZRqRgbMr sROQ9TNXVMYjNFeeyXdnpM0BNAdOIKCMI7eBkHsyARgKkXVVlAUkInatbkO/IyIUyJ4PaUJJAYkbxsgIrh1XXpDMfmR8lVpDT8FfumNebL4cILpcOCTfJ 4mn8Es8xKdOiGgEH6ZVqYrjWVkUwBwAHel4xGdat8i80wlIUh2q1z9IN0QggIHp4lCbnSeyeqiTh3WwFiM6Yv/1pHaYde/JSRo0fmdIhFrPGR383GXWqCkQK7yoUydu8e5Dq4qY1GPI9VcaAkMG68sVl762w3Us5/VvO41 nX1BlhFWNsg0VqDLHRvWL I/gsbXHffub34Je2UF1e0mL7ghmFEXT6k6fQ4FYvSEPQ8CI3KaxMW1RJfUBRqpzKfrzkfi6EgVDAKXQvJc4HvwSmdix8UkRXysger/yfzugVAqwUV2SC6qm m29MOHGgb37fCaL5fJOnXkvBeb7suYsT2RbyIvoA","original_type":"transaction","nonce":"qyzVVgtmQ0fk","algorithm":"AEAD_AES_256_GCM"},"resource_type":"encrypt-resource","id":"7b3b0fa6-a627-59c1-0733-2606ec31153c"}
微信支付回调返回参数resourceJson明文：====={"combine_appid":"wxd352ef315ac365bd","sub_orders":[{"transaction_id":"4323220200001484847904033204","amount":{"payer_amount":1,"total_amount":1,"currency":"CNY","payer_currency":"CNY"},"mchid":"1915696108","trade_state":"SUCCESS","out_trade_no":"out_trade_no2_1585030201441","bank_type":"OTHERS","trade_type":"JSAPI","attach":"123&456&789","success_time":"2020-03-24T18:07:43 08:00","sub_mchid":"1564468071"}],"combine_payer_info":{"openid":"ofMy16jrqy7Z8pS23M5JI4SkKvwc"},"combine_out_trade_no":"out_trade_no1_1504430158999","combine_mchid":"1811569960","scene_info":{"device_id":"POS1:12"}}
Wtimestamp:1546844504,Wnonce:jXQ70fE0SepL62SNpUhduNCooXF2RseC,Wsign:m2QZupx0hp3fPmfAfYD35FoYK o1DOzWQs8vkeGTiFY68JHkIlx1cx825sPbW/AHu5xsQ4nlOt4BZZ0Q4Z6szqYgxJUZe/JR0OXNtoG0yHq0m5teVLoFY5eEAuY3szAPC5RIsUOs0ByXP62KEiNNiw7sYbdVXDar4MkKLho7NY6sjaigRQZeSGvsV0q0TIy1HTQTR9otAJ5lnibwbheecXaCLvvkvHGr/kDPHkvnP1fIzVzeIM32VDTf9L4/k7vN4zdgd4R73Y/6hmk8vyTsB VfciqUpDUQ0rC0SigGzaLukawRK S3r4XBe1nNiM0jVTKIe5l7s8BO9THd gwI6A==
微信支付回调签名验证成功上一篇：电商收付通系列⑦，合单下单之小程序支付
