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I'm pretty sure Facebook allows you to setup a Donate button on your page pretty easily, and it would just ask for the URL you want to use for donations.
For that, you can go to www.paypal.com/buttons and create a donate button. At the end of the creation process you'll see a tab for Email, and this will provide a URL that could be used in email links or in things like a Facebook donate button.
Angell EYE - www.angelleye.com PayPal Partner and Certified Developer - Kudos are Greatly Appreciated!