72-hour Free Transit Eligibility

My schedule:
28 oct. 20.55h Amsterdam - 29 oct. 13.40h Chengdu (KL0891, Business Class)

Overnight stay 29 oct - 30 oct Mercure Hotel Chengdu North

30 oct. 8.35h Chengdu - 30 oct. 10.45h Guangzhou (CZ3378, Economy Class)
30 oct. 14.30h Guangzhou - 31 oct. 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 Chengdu (CZ3403, Economy Class)
5 nov. 15.30h Chengdu - 5 nov. 19.20h Amsterdam (KL0892, Business Class)

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