This was posted on Nextdoor:-
The trick is then that you also get an email appearing to be from Paypal addressing you by first name and surname to say that there is a message on the request from the requestor. The requestor says the payment is suspicious and if this is not genuine to call their 0800 number. This phone number may put you through to a scammer who will ask for all your personal details including credit card number and address. That is what they want to steal. So don’t call it. The transaction should expire off your Paypal account naturally after a few days as unauthorised but you can call Paypal to have it cancelled.
This scam tries to make people believe the payment has already gone through so check your credit card or bank account and you’ll see it hasn’t. Foreword any email you receive that you are suspicious of to phishing@paypal.com. Be safe."
You can find more information and advice on phishing here and how to report them.