What type of visa? 10-day teaching at Chinese univ

I'm a US citizen, and resident of France (10-year resident card). A Chinese university has invited me to lecture at their summer school in China starting July 20. I have an official letter of invitation.
*Which type of visa do I need?*
On a similar trip two years ago, the Chinese Embassy in Paris issued the "wrong visa" and the university was unable to meet its promise to pay me, which made us all very unhappy. In July 2019, my flight and other travel expenses will be reimbursed and I will be paid an honorarium. Thank you for your hlep.