overnight stay in shanghai

Hi!

I am planing an overnight stay in Shanghai city since I have 16 hours gap between 2 flights ( melbourne-shanghai and shanghai-london). If I understand correctly I dont need extra visa just 72-hours vis free transit. I already booked a hotel in Shanghai for 1 night.
What is the procedure to get this kind of permit? Can i get it at the Pudong Airport?

Thanks in advance.

Miha