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Scam. If someone really paid, you will see a record of payment in your PayPal account without having to pay for shipping first. That's not how PayPal works. You receive money first before shipping. No money, no talk.
Now PayPal may put holds on payments you receive but at least the funds is showing in a pending balance and marked On Hold in red and you see a record of payment and in this record of payment, PayPal will tell you if it is ok to ship or not.