To connect to USPS or Canada Post, use a carrier integration plugin. In WordPress, go to Plugins → Add New and install the official extension (e.g., WooCommerce USPS Shipping, Canada Post Shipping Method) or a multi-carrier tool like ShipStation/Shippo. Activate it, then open WooCommerce → Settings → Shipping. Create Shipping Zones for the countries/regions you serve and add the carrier method to each zone. Enter your carrier credentials/API keys (USPS Web Tools, Canada Post Developer keys), choose services, packaging, and rate rules. Enable label printing and tracking if supported. Save, run a test checkout, and verify live rates appear for customers.
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