We have added integrations with UPS and FedEx for our Canada clients. This will allow any Canada clients to automatically send out return shipping labels to any customers who submit a mail-in order. That way you will not be charged until the customer ships their devices/products.

There is nothing you will have to enable as long as you have set your account location to Canada. All you will have to do is fill out the Courier's settings under the add-on page and you should get a confirmation message saying it worked.