[splitbrain]

This confuses the heck out of me every time I have to work with the Paypal API. I never understood why they implemented it this way. It makes absolutely no sense IMHO but has always been this way. I'm surprised that this isn't used much more often for fraud.

[beejiu]

Some businesses store their delivery costs at PayPal (by country), rather than on their own servers. Hence, they have to go to PayPal to determine these costs. But then, that's just rather poor implementation on part of the retailer.