Guarantee
Not every transaction through Pay Pal is Guaranteed. Pay Pal has a Guarantee only if the seller is a "Verified" seller with over "30 Verified sales transactions". Plus, you have to "Click" on the Guarantee Refund box when it's offered to you. It cost's additional money for the Guarantee, but it's worth the protection if you're paying a lot of money or if you're sceptical of the seller. If Pay Pal doesn't give you the option to click on the "Guaranteed Refund Box" before you click the "Pay Now" button, then the seller hasn't completed enough "Verified Sales Transactions". Therfore you take on all the risk as a buyer.