Can I use the 72hr transit visas???

Hello, I'm planning to fly from Auckland/NZ directly to Shanghai(staying just for one day) and then from Shanghai to Hong Kong where I stay for two days.
I will have one way ticket from Auckland-Shanghai and then separate one way ticket Shanghai-Hong Kong
and then I have my ticket from Hong Kong back to Europe(this ticket is my return ticket but I started my trip in Singapore).

San I use this free Transit?
Thank you for your help!