You can get 4 or 6 months of free Uber One Membership with an eligible Westpac Mastercard. Eligible for new & existing Uber One Members.
Seems valid for redemption till 29th Feb 2024. I am currently on 6 months free CommBank Mastercard deal, so haven't redeemed this for now as I am not sure if it overrides the previous deal.
Edit: Just checked and I was actually on PayPal deal. Was able to redeem additional 4 months which will start once the PayPal trial period is over
You're allowed to stack the Paypal and mastercard offer, but you won't be able to accept a Mastercard Uber offer if you've already got an existing one lined up waiting to be used after the Paypal one. You'll just get an error "Unfortunately, you can’t use this offer since you already have another offer pending."
If you are already on the Mastercard offer, I believe accepting this one puts this onto a 'pending state'. and it'll activate after your current offer has finished