Retrieves a link to a ZIP file with the e-invoice files of the given invoices and credit notes (for example, PDF/A-3 with embedded Factur-X XML). You can request up to 10 invoices and credit notes at a time. For larger volumes, send multiple requests.
Only e-invoices that are ready are included. An e-invoice is generated when the invoice is sent, which can be after it was created. Request any invoices that are not listed in the response again on your next retrieval.
The files are fetched from the e-invoicing provider during the request, so the response can take a while.
If the e-invoicing provider is temporarily unavailable, the endpoint responds with 502 Bad Gateway. Retry the request later.

Required scopes: flex.billing.payments.documents.read