Mariano Gomez has a great post on using EFT for Payables to push payment information to PayPal. I love creative ideas like this that demonstrate the flexibility of Dynamics GP. By using EFT, instead of a Smartlist or report, Mariano maintains the AP controls that help prevent duplicate payments and fraud. Very nice job Mariano!
Fusing GP and PayPal with EFT for AP
Archived post from 2008. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.