ok to be clear, no human actually looks at your vax certificate/test results until you arrive in Canada?
For check in, you just show your arrivecan receipt? Or do airlines bother checking vax certificate?

I was talking to my in laws yesterday who are in their early 60s and not totally tech illiterate.
When I told them about all the hoops and apps and uploads and tests etc etc, their eyes glazed over.
I can only imagine how hard to navigate all this is for really old people who dont know how to internet.