Stop over in Shangai while going to Cambodia

Hi
We are two Spanish citizens travelling to Cambodia from Paris in May
We will get the Cambodian visa before entering the country
So we wont have it when arriving at Shanghai
My question is, do we still meet the requirements for the 24h stopover? Or do we need to have the entry permit for Cambodia in advance? We do have the plane ticket with the itinerary to Cambodia confirmed
We will fly with China Easter
Thank you