I really need your help. I am holding German passport, now I am traveling in China with tourist visa

next week I will go to S. Korea (Seoul) to travel. After Seoul I want to travel in China again because I didn't see all the places I wanted. Can I get Chinese tourist visa Double Entry? What documents, pictures or appication I need to prepare? I would like to pay more and will get visa in 2days if possible. Thank You so much.