PayPal IPN-如果细节错误该怎么办

Question

在IPN文档的末尾，它显示以下内容：

Important: After you have authenticated an IPN message (that is, received a VERIFIED response from PayPal), you must perform these important checks before you can assume that the IPN is both legitimate and has not already been processed:
1.Check that the payment_status is Completed.
2.If the payment_status is Completed, check the txn_id against the previous PayPal transaction that you processed to ensure the IPN message is not a duplicate.
3.Check that the receiver_email is an email address registered in your PayPal account.
4.Check that the price (carried in mc_gross) and the currency (carried in mc_currency) are correct for the item (carried in item_name or item_number).

如果其中一项检查失败，你该怎么办？我们是否应该以某种方式调用PayPal API来"拒绝"交易？

Answer 1

大多数商店都会将未通过这些检查的订单/交易标记为"可能的欺诈"或类似的行为。订单状态应提高处理订单的员工的意识——仔细查看应显示哪项检查失败，并可以采取进一步行动。

这可能包括为交易退款，以及联系PayPal以获取可能的欺诈企图。在任何情况下，都应该检查订单，而不仅仅是将其视为任何其他"已完成"订单。

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示例场景：

• 您正在使用未加密的网站支付标准HTML表单来接收付款。

• 欺诈买家发现并开始通过编辑提交的表单修改商品价格

• 您收到的订单是已付款的，并且没有根据交易检查您店铺内订单的价值

• 一名员工没有发现这一点，一件价值200美元的物品被寄出，支付0.01美元的

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