Buying shipping labels
If your fulfillment locations are eligible for shipping labels, then you can buy shipping labels when you're fulfilling an order in your Shopify admin. You can buy shipping labels individually or in bulk for multiple orders. After you buy a label, you can print it or void it when you no longer need it.
If your default location is in the United States and your business accepts returns, then you can also create and send return labels to customers through your Shopify admin. For international shipments, Harmonized System (HS) codes are required, and product descriptions must be detailed, precise, and use plain language.