Hello, Beijing Transit - Which Visa?

I am an Australian citizen. I have a flight from Sydney to Beijing arriving at 10pm in June. I have a separate ticketed flight departing Beijing to Helsinki the next morning at 10am which I must check in for. I wish to spend the night in a hotel near the airport between the flights. I will have the hotel booked prior to my arrival. I believe I can apply and receive a 72-hour free transit upon arrival in Beijing Airport. Is this the correct entry permit and method to use? Thanks.