72-hour Visa-free Transit in Chengdu

My schedule:
28 okt. 20.55h Amsterdam - 29 okt. 13.40h CTU

Overnight stay 29 okt - 30 okt Mercure Hotel North

30 okt. 8.35h CTU - 30 okt. 10.45h Guangzhou (CZ3378, Economy Class)
30 okt. 14.30h Guangzhou - 31 okt. 6.30h Auckland (CZ0335, Business Class)

AND

4 nov. 22.15h Sydney - 5 nov. 5.00h Guangzhou (CZ0302, Business Class)
5 nov. 7.35h Guangzhou - 5 nov. 9.55h CTU (CZ3403, Economy Class)
5 nov. 15.30h CTU - 5 nov. 19.20h Amsterdam (KL0892, Business Class)

I do have the flighttickets, seatconfirmation and Visa for Australia.
Can I get a 72h Visa free transit?
Is it possible to receive this by email? (Or only at Shuangliu Airport?)
Do I have to inform the Airline company?