You'll need these customs documents to ship to non-EU countries.

When shipping to countries outside the EU, shipments must be properly declared for customs purposes. Missing or incorrect documents can result in delays, additional costs, or even the return of the goods.
Key documents include the commercial invoice, the customs declaration, and, for certain types of goods, a certificate of origin. Depending on the destination country, additional country-specific documentation may be required.
An experienced fulfillment service provider automatically generates the necessary customs documents as part of the shipping process, thereby significantly reducing the sources of error that often arise during manual processing.
If you ship internationally, you should partner with a fulfillment provider that has extensive experience handling customs procedures. You can read more about cross-border shipping in the article “Cross-Border Shipping in the EU.”