Submit FatturaPA invoices to the Italian SDI via the SDICoop web service

Steps

1. Register your software or intermediary channel on the Agenzia delle Entrate portal at fatturapa.gov.it and obtain the WSDL and XSD files for the SDICoop Trasmissione service (currently at specification version 3.1).
2. Generate a client TLS certificate and a server TLS certificate (separate RSA key pairs) and upload the certificate signing requests through the portal; both certificates must be in place before the SDICoop channel can be activated.
3. Build a FatturaPA 1.2 XML document signed with an XAdES or CAdES digital signature; validate the XML against the official XSD before submission.
4. Invoke the SDICoop Trasmissione SOAP web service, attaching the signed invoice file; the service returns a receipt containing the SDI identifier (IdSdI) and receipt date.
5. Poll the SDICoop Ricezione service or check the portal for delivery notifications; the SDI will return one of: consegnata (delivered), mancata consegna (delivery failed — you must notify the recipient via alternative means), or scartata (rejected — resubmission required after correction).
6. Retain the SDI identifier, receipt date, and delivery notification for each invoice to satisfy the 10-year Italian archiving obligation.