Apologies if this is too over-simplified.
If you received an email asking for any kind of info, it's probably a scam. Don't click any links you get in emails.
If you type https://www.paypal.com
into your browser address bar and the Paypal website asks for an address, it's probably legit. They have my address on file. I have never sent them any ID but I believe they need a billing address that matches your credit card or checking account.
(As a general rule, never send someone a copy of your ID)