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Description
When a payment is verified through non-merchant payment gateway, PayPal Payment's Standard, set the return value reference_id to the received payer email address if available, or default to the current behavior (null).
Clients sometimes pay with a PayPal address that is different than the email provided during sign up, and it can be difficult to determine what that address is. To solve this, store the PayPal email address in the transaction "Reference #" field, where the last 4 of credit card transactions is currently stored.