I am currently writing a catalog on computer vended postage (CVP, ATM, Frama) from non-European, non-US countries.
Of course, it'll also include Canada (see screenshot of the 2-page draft of the Canada section).
I am going to list four issues:
 09/2008 Pitney Bowes issue
- listed small and large format stamps; kiosk IDs
 12/2012 Wincor Nixdorf issue (maple leaf)
- listed two print runs; depicted label with lines for printer adjustment
 10/2016 Diebold Nixdorf issue (paintings)
- listed 14- and 18-digit numbers; "11" error; kiosk IDs
 Besides, I will list the issue for of a vending machine trial (Klussendorf?) that supposedly happened in a Montreal PO in the 1990s.