网站用支付宝做交易，支付流程有什么注意事项
网站用支付宝做交易，支付流程有什么注意事项
回复内容：
网站用支付宝做交易，支付流程有什么注意事项
回调请求和回调状态多加日志，多做状态检查！！！
生成支付单号的时候，注意加上支付过期时间，防止在自己平台上支付过期取消了，可是在支付宝上还能付款。
写异步通知时，要注意上面这种在自己平台订单是取消状态，但支付宝还能付款的情况。对于这种情况一定要做日志，否则等着客户投诉吧。
支付宝支付成功，收到的支付消息，分为：同步通知和异步通知。要注意在业务逻辑中，判断订单有没有被处理过。防止业务逻辑重复执行。
应该有官方接口文档的，自己多测试下
1.日志监控是必不可少的，在坏帐时有据可查
2.如果支付过程服务端处理时间较长，例如需要各种查表，插表，那前端需要轮询服务端订单的状态
3.为了避免主从库延迟（写在主，读在从）导致重复下单，订单状态获取异常，通常在写DB之前加一层cache
4.支付的商品如有特殊字符，支付宝的接口是不支持的，文档里没有说明，这个可以咨询支付宝客服
5.支付宝快捷支付和网页wap支付是有区别的，good luck
支付宝会在3个月后再会调一次，说明这笔支付已经是不可退款了。这个时候是不应该再给用户充值或者支付的。（文档没看清，谁知道支付宝还有这种会调呢）
日志必不可少，同时建议网站的数据库支持事务处理
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