PayPal Notify and Store Parameters
We added another step in the 'post payment' process. A user now returns to a thank you page and must click a link to see their order. This gives time for PayPal's Instant Payment Notification to update the order to Confirmed.
On the admin side we added a tab for all the store parameters. Funny how they add up. When installing or updating, be sure to open the Store in the backend and check the parameters. You have to save them once for any new ones to have effect.
One parameter we added is a choice to tax shipping or not.
Update and enjoy!