Ok thanks Jason.
I'm testing it now - and I first decided to test PayPal Express. (That should work even though I've chosen PayPal Pro right?)
But anyway - It worked with PayPal Pro and PayPal Express!! Huzzah!
Jason - I still have another open issue. Eric Mittman has been helping me - It's here:
The store is working - but I'd like to change which field is added up with the eCart object.