It's actually 3 years old. Unfortunately I doubt there's anything relevant in it now. 
Edit: Actually there may be some kind of roaming agreement between different charging networks in Canada and the US.
electricautonomy.ca
Edit: Actually there may be some kind of roaming agreement between different charging networks in Canada and the US.

Major EV charging networks sign roaming agreement, opening door for more flexibility
Canadian fleets and drivers are set to benefit from the convenience of using one card or app to access chargers from several networks
