No, not everything with everyone. That would be wrong and insane
Here's from official documentation: (click on link to see everything, I'll just quote up a few paragraphs)
WITH OTHER PAYPAL USERS
When transacting with others, we may provide those parties with
information about you necessary to complete the transaction, such as
your name, account ID, ...
To show a warning note on a return merchandise authorization (RMA) form that only appears if the order was placed after the store's time limit for returns is, add a Date input field to the form and label it "Date of Purchase", then in the Date Field's Show Custom Error setting select "When" and add the following Custom Expression: