***URGENT***Toronto -> Shanghai -> Beijing *2 nights* -> Bangkok -> Shanghai -> Toronto

I land in Shanghai on 4/10/19 and take a connecting flight to PEK. Am I going to have to go through customs in Shanghai?

Also, do I need a visa to connect to my flight to PEK so I can get to Bangkok on 4/12/19?

Do I qualify for a 72 hr or 144 hr visa (will be staying for less) in PEK?