Travelling to Shenzhen for 24 hours then Shanghai for three days from Thailand

Chris, as you will travel in two cities, you don't qualify for the 72-hour free transit policy or the Shenzhen VOA, so you need to get an L type entry permit in advance. To apply for it, your passport, a passport copy, a fully completed application form, a 48 x 33 mm color bare-headed photo, and transportation tickets and hotel reservations are needed.