每张信用卡的paypal payer_id是否唯一? [英] Is the paypal payer_id unique per credit card?

问题描述

我想知道使用同一张信用卡进行两次单独付款时，paypal payer_id是否相同.显然，这对于检测可能的欺诈交易很有用.

请注意，在使用贝宝帐户的情况下(即，用户使用电子邮件登录，而不是随时随地"付款)，我认为即使用户更改了电子邮件等，payer_id也始终相同.我的具体问题是关于信用卡付款.

我将使用Express Checkout API.

谢谢

解决方案

我运行了一些测试，并且根据沙盒，PayPal系统确实为来宾结帐"系统中使用的每张信用卡创建了唯一的付款人ID. >

我第一次使用带有特定MasterCard的Guest Checkout进行Express Checkout.在检查GetExpressCheckoutDetails后，我确实看到我得到了付款人ID，在这种情况下，它给了我DKG3GNSK44HV2.

然后，我用另一张Visa卡做了同样的事情，它还给我发回了QXQGEYLFMBNY8的付款人ID.

然后，我使用原始的万事达卡再次进行了相同的操作，并且得到了与第一次使用的相同的付款人ID DKG3GNSK44HV2.

最后，我再次尝试了Visa，并获得了与第一次使用相同的QXQGEYLFMBNY8付款人ID.

基于这些测试，我会说PayPal确实为他们系统中使用的任何信用卡生成了唯一的Payer ID.

这是有道理的，因为在实际迫使您创建帐户之前，他们对通过Guest Checkout使用任何给定信用卡可以花多少钱有限制，并且他们也不允许您在Guest中使用信用卡检出该卡是否已添加到现有的PayPal帐户中.

I wonder if paypal payer_id is the same for two separate payments with the same credit card. This is obviously useful to detect possible fraudulent transactions.

Note that in the case of paypal account (that is, user logging in with email, not paying "on the go", I presume that the payer_id is always the same, even if user changes email, etc). My specific question is about credit card payments.

I will be using Express Checkout api.

Thanks

解决方案

I ran some tests and according to the sandbox the PayPal system does create a unique Payer ID for each credit card used in the "guest checkout" system.

I went through Express Checkout the first time using Guest Checkout with a particular MasterCard. Upon checking GetExpressCheckoutDetails I do see that I get a Payer ID back, in this case it gave me DKG3GNSK44HV2.

I then did the same thing with a separate Visa card, and it gave me back a Payer ID of QXQGEYLFMBNY8.

Then I did the same thing again with the original MasterCard I used and I got the same Payer ID of DKG3GNSK44HV2 that I did the first time.

Finally, I tried the Visa again and got the same Payer ID of QXQGEYLFMBNY8 that I did the first time with it.

Based on those tests I would say that PayPal is indeed generating unique Payer ID's for any credit card used in their system.

It makes sense because they have limitations about how much money you can spend with any given credit card through Guest Checkout before they actually do force you to create an account, and they also won't let you use a credit card in Guest Checkout if that card is added to an existing PayPal account already.

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