Indicates the format of the artifact to download. The following formats are supported:
VRBL
The full representation of the invoice in the canonical form described by the VRBL Reference Guide
PDF
A human-readable version of selected information in the invoice
LegalDocument
The legal representation of the invoice. For Inbound invoices, this will be the exact document received. For Outbound invoices, this is the invoice as transmitted to the network
Archive
A ZIP file containing all artifacts related to the invoice. For a completed invoice, this will always include the VRBL, PDF, and legal document, and may include additional files like confirmations, acknowledgments, signature files, or timestamps depending on the jurisdiction
Attachments
A ZIP file containing any attachment files which are embedded in the VRBL document
All
All of the formats are retrieved
Multiple formats can be retrieved in a single request by specifying "All" or by specifying a comma-delimited list of formats (like VRBL,PDF). If multiple downloads are requested, the response will have Content-Type: multipart/mixed and a Content-ID header will be included with the format for that part
