I spoke with a Paypal representative, who said if the Add to Cart button is made in Paypal, all I would need to do is put in a 0 for the tax to override the Paypal Profile Based Shipping specifications for that button. If the button is made by your plugin, they said I would have to get with you about that…
So hopefully this does not mean I would have to make the buttons in Paypal, as I was hoping to avoid that step in the setup process.
Thanks.