Selling memberships to specific country

I am looking for help. 
I would like to sell a membership on my Squarespace site but only want it available to Canadians. It is a very niche membership. 
I hope this is possible through code or some other means.  I am baffled why this seems impossible. Please help 

2 hours ago, paul2009 said:

You can limit shipping or physical goods to certain countries, but there isn’t a way to limit digital products to a specific country.

Why could the billing information drop down for country not be edited to only include Canada?

9 hours ago, Seylerg said:

Why could the billing information drop down for country not be edited to only include Canada?

You cannot edit anything on the checkout page because it is locked down by Squarespace. This prevents you editing the country dropdown.