15 hour layover in shanghai

Your itinerary is definitely eligible for 24 hour visa free transit, but it is temporary entry permit that you need to visit Shanghai. To be eligible for this permit, you will book an accommodation in Shanghai and print out a confirmation of your accommodation booking.

Upon your arrival in Shanghai, you will approach 24 hour visa free transit counter where you will apply for a temporary entry permit and you will immediately enclose the mentioned accommodation confirmation. If you do as suggested, you will be granted a temporary entry permit practically for certain.