You have the option to add Canada Post as one of your return shipment couriers.
Steps to Connect Canada Post
In the Shipped Suite Merchant Admin, go to Returns > Courier Accounts.
Locate Canada Post and click "Connect".
Enter the following information
Customer Number
Contract ID (optional)
API Key
Click "Add Account".
If you need any assistance with setup, feel free to reach out to support@invisiblecommerce.com.