If you have a credit card on file with Paypal, check it regularly and carefully.
I tried to pay for something through Paypal with my credit card and it came back deactivated unable to use.
I called Paypal and was told a transaction went through my credit card by paypal and it was a risk so they deactivated and removed my card.
I asked why no notice they said I should have got an email. There was also no alert on my account and never received an email.
They are investigating as I am not a happy about their lack of security.
I then called my credit card company and found out a transaction had gone through on 10/10 so I reported as unauthorized, they have opened a fraud investigation and are sending me a new card.
If I would not have tried to use my card and found about a problem, this would have gone undetected until I got my next statement from VISA and who knows what else would have gone through my credit card.
Paypal seems to be very lax in these issues as far as I am concerned and in my opinion have become very untrustworthy.
Yet Ebay is going to only accept them as a payment processor which also concerns me now.