Creates a PINT-AE compliant e-invoice in one request, without creating the buyer or the items first, and submits it to the Peppol network. The buyer is matched on tax_identification_number and each line's item on item_code, both within the authenticated branch — whatever already exists is reused unchanged, whatever is missing is created. Every rule that POST /invoices applies also applies here. Note that the parties and items are created before the invoice is validated, so a rejected invoice can leave them behind.

Omit peppol_id for a buyer who isn't on Peppol — the right predefined endpoint is substituted at submission and the document is reported to the FTA instead of delivered.