I will be flying from France to New Zealand.

I have 2 hours layover in Shenzhen just to take an other fly with the same company.
Do I need a visa?
By the phone, a company which is able to issue a visa told me that we can get a free 72 hours visa when we gonna land at the airport since this year.
Is it true?

As weel, my first layout is in Pekin,
In fact I do Paris to Pekin, Pekin to SZ, then to Auckland. But never more than 5 hours in the airport .
Thank you