Please clarify what organisation the Postbillpay (via Paypal) payment was being made to.
Separately, I can confirm that a health insurance payment (Medibank) using Postbillpay>Paypal only got 0.5 pts on the Edge, so Paypal is communicating the identity of insurers to Amex, as well as utilities reported by others.
My telstra bill paid via PayPal on Reserve yielded 0.5 points. :-(