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Yes, the Canada Post class enforces this. You must have weights in kg, and currency in CAD, which is what Canada Post expects and replies.

Canada Post does not offer a public API to generate labels. PayPal evidently worked a deal with them to provide their functionality.

They do provide a web interface to generate labels. A motivated...

Shipping quotes for Sell Online account holders, for domestic, US, and overseas shipping methods. The store must be configured for CAD currency, and weight in kilograms.

Also, the box-packing...