客户端实现ios订阅支付后，支付成功会返回一个收据（一大串随机字符串），需要请求苹果服务器的接口来校验该收据的真实性，同时校验完成后苹果服务器也会发通知告诉我们的自己的服务器（ios后台配置的回调地址），这个时候就需要服务端来接入苹果服务器并处理该支付逻辑。这里不使用客户端直接接入苹果服务器校验收据接口的原因大概就是因为订阅类型需要共享密钥，防止该密钥暴露，同时服务器接入能更好处理逻辑。
接入必要配置
1.订阅类型需要从苹果后台获取一个共享密钥
2.需要在苹果后台配置好回调地址
3.需要配置订阅产品（周期，价格，我自己没什么了解，这个需要注意的是订阅有按组分，同一个组和不同组的产品是有区别的，例如同一个组的不同产品进行购买，他们的原始订单可能相同）
接入必要资源
简体中文文档 - Apple Developer
校验收据：通过 App Store 验证收据 - 简体中文文档 - Apple Developer
回调通知：启用 App Store 服务器通知 - 简体中文文档 - Apple Developer
退款处理：处理退款通知 - 简体中文文档 - Apple Developer
收据校验沙箱环境：https://sandbox.itunes.apple.com/verifyReceipt
收据校验生产环境：https://buy.itunes.apple.com/verifyReceipt
接入流程
1.服务端接入apple校验收据接口
注意事项：防止相同数据重复校验或者相同请求大量请求导致的不稳定因素，建议使用时间戳校验预防，不要将共享密钥暴露在客户端，共享密钥同时也可以对回调通知进行校验，校验收据后不要做为订单处理，最好一切以回调为主。
接口地址：https://buy.itunes.apple.com/verifyReceipt
接口类型：POST
接口格式：appliaction/json
功能说明：该接口主要是用来恢复订阅和支付校验，校验完成会有回调通知到商户服务器
请求参数：
官方：Apple Developer Documentation
{"password":"这里是共享密钥","receipt-data":"这里是收据的字符串"}
返回结果:
状态码：Apple Developer Documentation
失败：
{"status":21000}
成功：
成功结果参数文档：responseBody | Apple Developer Documentation
主要参数说明:
{"environment": "Production", //请求环境"receipt": {"receipt_type": "Production","adam_id": xxx,"app_item_id": xxx,"bundle_id": "com.xxx","application_version": "2","download_id": xxx,"version_external_identifier": xxx,"receipt_creation_date": "2022-10-24 07:14:36 Etc/GMT","receipt_creation_date_ms": "1666595676000","receipt_creation_date_pst": "2022-10-24 00:14:36 America/Los_Angeles","request_date": "2023-02-24 03:29:47 Etc/GMT","request_date_ms": "1677209387760","request_date_pst": "2023-02-23 19:29:47 America/Los_Angeles","original_purchase_date": "2022-07-04 03:24:29 Etc/GMT","original_purchase_date_ms": "1656905069000","original_purchase_date_pst": "2022-07-03 20:24:29 America/Los_Angeles","original_application_version": "2","in_app": [ //所有订单都可能存在，主要是非订阅订单{"quantity": "1","product_id": "xxxx","transaction_id": "xxxx","original_transaction_id": "xxx","purchase_date": "2022-07-04 03:25:29 Etc/GMT","purchase_date_ms": "1656905129000","purchase_date_pst": "2022-07-03 20:25:29 America/Los_Angeles","original_purchase_date": "2022-07-04 03:25:30 Etc/GMT","original_purchase_date_ms": "1656905130000","original_purchase_date_pst": "2022-07-03 20:25:30 America/Los_Angeles","expires_date": "2022-07-11 03:25:29 Etc/GMT","expires_date_ms": "1657509929000","expires_date_pst": "2022-07-10 20:25:29 America/Los_Angeles","web_order_line_item_id": "xxx","is_trial_period": "false","is_in_intro_offer_period": "false","in_app_ownership_type": "PURCHASED"}]},"latest_receipt_info": [ //订单订阅集合，从上往下订单时间倒序，第一个为最新的支付订单{"quantity": "1","product_id": "xxx", //订单产品id，apple后台支付配置的参数"transaction_id": "xxx", //apple当前订单号"original_transaction_id": "xxx", //apple原始订单号，该用户在该产品第一笔支付订单，可当做同一批订单朔源"purchase_date": "2022-11-25 08:19:27 Etc/GMT", //订单时间"purchase_date_ms": "1669364367000","purchase_date_pst": "2022-11-25 00:19:27 America/Los_Angeles","original_purchase_date": "2022-07-04 03:25:30 Etc/GMT", //最初购买时间"original_purchase_date_ms": "1656905130000","original_purchase_date_pst": "2022-07-03 20:25:30 America/Los_Angeles","expires_date": "2023-11-25 08:19:27 Etc/GMT", //订阅过期时间"expires_date_ms": "1700900367000","expires_date_pst": "2023-11-25 00:19:27 America/Los_Angeles","web_order_line_item_id": "xxx","is_trial_period": "false", //是否是试用订单"is_in_intro_offer_period": "false","in_app_ownership_type": "PURCHASED","subscription_group_identifier": "xxx"}],"latest_receipt": "------------加密串------------","pending_renewal_info": [{"auto_renew_product_id": "xxx","product_id": "xxx","original_transaction_id": "xxx","auto_renew_status": "0"}],"status": 0 //状态成功
}
2.apple支付回调通知接入
回调通知配置:苹果后台可配置生产环境和沙箱环境的APPLE回调通知地址
接入文档：responseBodyV1 | Apple Developer Documentation
提示:接入apple支付回调apple提供了v1和v2两种类型，v2需要多一步加解密的操作
功能说明：该通知主要是订单状态的变更等，包括续订，付费通知，取消订阅，退款等通知
可进行订单处理
通知类型说明:
INITIAL_BUY
首次购买
REFUND
退款
CANCEL
取消订阅
DID_RENEW
自动续订
INTERACTIVE_RENEWAL
应用界面或appstore手动续订
DID_RECOVER
恢复订阅
回调请求参数示例
{"notification_type":"DID_RENEW", //通知类型,该类型为续订通知"auto_renew_product_id":"xxx","password":"xxx", //共享密钥，可以验证是否真实通知"environment":"Sandbox","original_transaction_id":xxx,"unified_receipt":{"status":0,"environment":"Sandbox","latest_receipt_info":[ //第一笔为最新的通知订单{"quantity":"1","product_id":"xxx","transaction_id":"xxx", //当前订单号"purchase_date":"2022-06-08 09:51:55 Etc/GMT","purchase_date_ms":"1654681915000","purchase_date_pst":"2022-06-08 02:51:55 America/Los_Angeles","original_purchase_date":"2022-06-08 04:36:20 Etc/GMT","original_purchase_date_ms":"1654662980000","original_purchase_date_pst":"2022-06-07 21:36:20 America/Los_Angeles","expires_date":"2022-06-08 09:54:55 Etc/GMT","expires_date_ms":"1654682095000","expires_date_pst":"2022-06-08 02:54:55 America/Los_Angeles","web_order_line_item_id":"xxx","is_trial_period":"false","is_in_intro_offer_period":"false","original_transaction_id":"xxx", //原始订单号，该产品首次的订单号"in_app_ownership_type":"PURCHASED","subscription_group_identifier":"xxx"},{"quantity":"1","product_id":"xxx","transaction_id":"xxx","purchase_date":"2022-06-08 09:48:03 Etc/GMT","purchase_date_ms":"xxx","purchase_date_pst":"2022-06-08 02:48:03 America/Los_Angeles","original_purchase_date":"2022-06-08 04:36:20 Etc/GMT","original_purchase_date_ms":"1654662980000","original_purchase_date_pst":"2022-06-07 21:36:20 America/Los_Angeles","expires_date":"2022-06-08 09:51:03 Etc/GMT","expires_date_ms":"1654681863000","expires_date_pst":"2022-06-08 02:51:03 America/Los_Angeles","web_order_line_item_id":"xxx","is_trial_period":"false","is_in_intro_offer_period":"false","original_transaction_id":"xxx","in_app_ownership_type":"PURCHASED","subscription_group_identifier":"xxx"}],"pending_renewal_info":[{"auto_renew_status":"1","auto_renew_product_id":"xxx","product_id":"xxx","original_transaction_id":"xxx"}]},"bvrs":"xxx","bid":"com.xxx","auto_renew_status":"true"
}
接入问题说明
1.latest_receipt_info集合订单按时间倒序排序，所以第一笔为最新的订单
2.ios收据为账户维度，即收据和通知获取的数据为该账户的历史订单集合，非当前支付
3.ios订单未返回金额等参数，需要自己做处理
4.ios退款通知不支持订阅类型
5.apple支付为全球性支付，需要自己处理货币转换
6.同一个产品包括同产品组，在同一个账户支付会生成一个原始订单号，可根据该订单号溯源
7.订单校验只适用于恢复订阅和收据校验，具体支付处理按通知为主
8.状态码21007为测试环境的收据请求到了正式环境
