I sold an ingame item, a counter strike global offensive knife through paypal and he said he sent the money, i got an invoice email from paypal but it says marked as paid.
Here are some other screenshots, can anyone help me with this its been almost 5 hours and i haven't received the credits.
If your are the seller, you are the one who sends an invoice to the buyer - "an invoice is a list of goods sent or services provided, with a statement of the sum due for these; a bill which is sent to the buyer by the seller". Sorry but, most likely you have been scammed and the info you received was a spoof.
If you don't have proof that you sold something - it's a moot point. Sending the buyer an invoice is proof however, selling of intangible, non-physical, items, including digital goods, and services is not covered under Seller Protection.
