I sold a product (user manual and very exclusive database) to what I believe was an impulse buyer. I charged several hundred dollars for this material. As soon as the buyer received an email informing him that the product had shipped, he filed a chargeback with his credit card company. I gave PayPal the Fedex tracking number and went away, thinking I had lost that several hundred dollars.
Tonight, I got an email from PayPal saying that because I followed their guidelines, they will continue to fight the chargeback, but that is no longer my problem. They are going to cover the amount of the chargeback under their seller protection policy.
I didn't even know I was following their guidelines.
This is exciting.