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The commercial invoice is a required document on all international shipments. Customs uses it to:
If the commercial invoice is incorrect or is not provided, the shipment can be delayed, held, or returned.
After choosing who will pay the customs charges (for example, Envia Guaranteed or the recipient pays on delivery) and checking that all shipment information is correct, click Generate label.
On the confirmation screen you will see:

Click Print label from the shipment confirmation.
The system will download a PDF file that includes:
Print the commercial invoice in three copies and give the copies to the carrier along with your package.

If the commercial invoice is not provided or contains errors, situations such as these can occur:

Customs will compare the commercial invoice information with what you declared on the shipping label. Before you hand over the package, check that the following data matches:
Declared value
Product description
Examples:
Export reason
It must match what you selected on the label: Sale, Gift, Sample, Return, or Warranty.
Export Declaration / Customs Reference No.
If you exported from the US with a value over 2,500 USD and saw AES ITN, the same number (X + 14 digits) should appear next to the incoterms.