It may have changed in the facelift, but I thought it was the same throughout the P3 era?
https://www.youtube.com/watch?v=tdvsSG9TV4I
There's a cap in the centre, sort of up and behind the handle. Pop this off and there's a torx. Two on the front doors, but just one on the rears. Don't tighten too hard, it's plastic and does crack (guess how I know...)