[AlphaCommerceHub] What are the possible values of the `PayerDetails`.`Custom2` field of a response to the PayPal's `PaymentStatus` API request?

Extensions AlphaCommerceHub
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1

It contains the customer’s email address in my case: a PayPal’s PaymentStatus API request, and a response to it.
What are the other possible values?
The «PayPal October 2017» specification does not answer the question.

2

The buyer email address. This is documented in our offline PayPal guide.

@Steve_Rivas can we check as sample PaymentStatus is missing from online documentation and that included the note on this field