Upload proof of ownership document

Uploads a proof-of-ownership PDF for a company that is being registered in the Peppol network.

The document must be a valid PDF (application/pdf). Once uploaded the service validates the document and, if accepted, completes the registration flow for the silo entry.

This endpoint is idempotent: uploading a new document for an entry that has already completed registration replaces the previous one and re-triggers completion.

{
  "data": "JVBERi0xLjQK..."
}