In a similar thread in this section I've presented a way to get Bitcoins and paying by Paypal. In order to prevent fraud, a PIN code (free) is sent to the customer's mobile phone. It could be interesting for newbies and people needing immediate bitcoins at a premium.
The thread is at
https://bitcointalk.org/index.php?topic=38873.0 and so far customers are satisfied

How can you be sure that the phone number is accurate? Paypal doesn't give you they phone number nor ebay.
In a similar thread in this section I've presented a way to get Bitcoins and paying by Paypal. In order to prevent fraud, a PIN code (free) is sent to the customer's mobile phone. It could be interesting for newbies and people needing immediate bitcoins at a premium.
The thread is at
https://bitcointalk.org/index.php?topic=38873.0 and so far customers are satisfied

I may be wrong here, however there were times I used to sell on ebay through paypal. From what I got there, the main issue with scammers is not about anonymous guys playing with a bunch of stolen CCs. A person may scam you just because there's an opportunity to do so. He/she could be 100% real, with confirmed address, phone and whatever else. Still if there is a safe and painless way to rollback credit card spendings, many of them will surely go this way.
The bottomline as I see it - verifying buyer identity, intention and consciousness could never protect from further chargebacks if there's no legal obsticles for a person to perform it.
First my excuses for not answering these questions, I havent seen them until now.
I am sure that the mobile phone is accurate since I send a unique 5-digit PIN code to that number. This ensures that the user has physical access to the mobile phone.
Concerning the question about scammers that use their real, verified accounts, they will have a hard time trying to win the dispute. They are paying to belong to the Hall of Fame, which is public, and it's trivial to verify that. In addition, in the Paypal's receipt it's clearly stated what he is paying for: "Position in the Hall of Fame for the address ****** and amount **". And, in any case, the person who does that will be immediately banned from the service.
No, my point here is.. where are you getting the PHONE number from... how do you know the PHONE number belongs to the account holder? So what if a hacker uses a pay as you go cell phone or something ?
If you send a code to that phone sure you have a phone number but how do you know it is the real phone number of the person trying to buy with paypal?