Canada Post WooCommerce Shipping Plugin
It is a plugin that adds support for Canada Post to WooCommerce. The plugin is called Canada Post Shipping For WooCommerce.
When the plugin has been successfully installed on your website, consumers will be able to select Canada Post as a shipping method during the checkout process. Using the weights that you specify for each of your items, the plugin will automatically compute the shipping prices for your clients, including both letter and package delivery.