...and more importantly, there's been an accusation against one user here for asking for ID from another user and then going straight out and using that ID to access their real life bank account, so I wouldn't be too trusting of a newbie offering ID here just now.
This is just one of those feeble attempts to paint a PayPal trade more trustworthy than it is.
1) There is no way for the lender to verify the ID so it can be fake/stolen etc.
2) ID doesn't prevent the payment from being charged back.
3) Even having full and accurate dox would be useless for a 10£ or a £10 dispute - what are you gonna do with it?
tl;dr: don't do PayPal.