Indian Passport holder with 12 hours of Transit wait in Xiamen

Sorry forgot to aksed one more thing is there any specific document required? What are the process.. please guide me so prepare before visit...
"Hi I am holding vaild Chinese visa but it's single entry. and I am traveling to Taipei Taiwan from cheju South Korea.i have around 12 hrs layover at Xiamen airport so I am eligible for 24 Free transit ?"