As hard as it is to believe in the year 2017, their website says you must go to the office and fill in a form. Where that office is located is a bit of a mystery, as their office finder shows locations that look to have nothing to do with collecting duties (such as cruise ship operations, if you are in downtown Vancouver).
http://www.cbsa-asfc.gc.ca/import/couri ... n-eng.html
What are the steps I need to know?
When the courier attempts to deliver the shipment, you must refuse delivery and advise the courier that you will pay duties and/or taxes directly to the CBSA.
Write down the unique shipment identification/tracking number. The shipment will be returned to the courier's warehouse for storage for a limited period of time.
Next, visit a local CBSA office that offers accounting services to the public. You will need to provide specific details about the shipment, indicated on the commercial invoice.
You will need the shipment identification/tracking number, the commercial invoice (receipt), and personal identification when you visit the CBSA.
If someone else is doing this step on your behalf, the CBSA requires a letter of authorization and a photocopy of your identification.
You will be given an official receipt indicating that you have paid duties and/or taxes paid to the CBSA.
A copy of this receipt must be presented to the courier, either in person or by fax, at which time receipt or delivery of the shipment may be arranged.