Fraudulent buyer through Facebook marketplace and PayPal emails

I decided to sell a product worth 800$ to a person through Facebook marketplace. He/She preferred PayPal as a method of payment and asked me to send a payment request for 800$ through PayPal. So, I sent a payment request for the amount through the PayPal app. Following that I get this email from a s…

https://www.paypal-community.com/t5/Security-and-Fraud-Archives/Fraudulent-buyer-through-Facebook-marketplace-and-PayPal-emails/td-p/2817834