PayPal txn_id IPN 检查
首先我要说的是，是的！我确实浏览了“具有类似标题的问题”，但找不到我的问题的答案。我在我的网站上有会员资格，每次用户购买高级版时，他们都会获得 1 个月的会员资格（存储在数据库中为 unix_timestamp），这背后的逻辑是每次他们购买时，它只是将其添加到时间戳
date("t") * 24 * 60 * 60
日期（“t”）中一个月中的给定天数。
我正在使用 PayPal IPN，它希望我检查 txn_id 是否存在。我以前从未使用过 PP IPN，所以我不知道那是什么？是为了防止骗子吗？假设它存在，是否意味着用户正在尝试进行相同的付款？
Let me start by saying that, Yes! I did go through "Questions with similar titles" and couldn't find an answer to what my question is gonna be. I have a membership on my website, every time user purchases premium they get 1 month of membership (Stored in database as unix_timestamp) and the logic behind this is every time they purchase, it just adds this to timestamp
date("t") * 24 * 60 * 60
date("t") is the given number of days in a month.
I am using PayPal IPN and it wants me to check if txn_id exists. I've never used PP IPN before so I don't know what the roll of that is? Is it to prevent scammers? And lets say if it exists, does it mean that the user is trying to make same payment?
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这是为了防止“越线”并且您两次收到同一付款的通知。
- 因此，您不会在 2 个月内向您的用户发放积分，而她实际上只支付了 1 个月的费用。
前任。如果您对第一个通知的验证/确认太慢，他们会再次发送
- 看起来你的系统是一个新系统..（除了它具有相同的 txn_id）
It's in case "lines get crossed" and you receive notification of the same payment twice.
- so you don't credit your user for 2 months, when she's actually only paid for one.
Ex. if your verification/confirmation of the first notification is too slow, they'll send it again
- appearing to you're system as a new one.. (except, it has the same txn_id)