This scam is cleverer than most: the email and invoice are genuinely from PayPal, because anyone can send a PayPal invoice to anyone. The invoice is for something you never ordered, often an expensive gadget or a protection plan, and the seller notes hide a fake 'PayPal support' number to call about the 'fraud.' Paying the invoice, or calling that number, are the two ways to lose. An unpaid invoice is not a charge and never becomes one on its own.
Every usual check passes: the email really is from PayPal, the link really goes to PayPal, and the invoice really exists in the account. What is fake is the story around it, that a purchase happened, that money left your account, and that the number in the notes is PayPal support. Invoicing is an open feature built for freelancers and sellers, and scammers exploit the trust the genuine platform creates.
Can an unpaid PayPal invoice hurt my credit or account? No. Ignoring or canceling a money request has no effect on your credit or your standing with PayPal. It simply sits there until canceled or it expires.
How did they get my email address? Invoicing only needs an email address, and addresses circulate in old data breaches and public lists. Receiving one says nothing about your PayPal account being compromised, but it is a good reminder to use a unique password and two-factor authentication there.