This article will outline how to link your Canada Post account to Easyship.
Linking Your Canada Post Account to Easyship
Step 1: Navigate to the Couriers > Add new courier.
Step 2: Proceed to select Canada Post.
Step 3: Enter the account name and merchant number (typically used as a username when logging in to the Canada Post portal).
Step 4: You will then be redirected to Canada Post. Select your preferred payment option on Canada Post. Note that all shipping costs will go through your Canada Post account directly. After clicking Continue, read the terms and conditions, then click Submit if you agree. 
After clicking Submit, you will be brought back to Easyship. Congratulations! You are connected. 