How do you identify users when using PayPal?

From this article on CodeGuru about IPN PayPal, I see that there are two fields: payer_email and payer_id, which can be used to identify the user. Is there anything else I'm missing? Do you use these fields to identify the user or how to do this?

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I used the 'custom' variable to store the user id on my system. Then, when the ipn notification returns to my site, I use the value in "custom" to search and identify the user when processing ipn.

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Source: https://habr.com/ru/post/1728309/


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