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B2G e-Invoicing process

actors:

  • Supplier: a private or public administration company incorporaed in italy
  • SDI (Sistema di Interscambio - Data Exchange system): back end service managd by a company named SOGEI on behalf of the Italian Ministry of Finance
  • Buyer: a public administration company incorporated in italy
  • Agid: italian competent authority for the e-invoicing specs
  • e-invoicing intermediary: a third party private company offering web services to facilitate E-INVOICE management (preparation, digital signature, sending and receiving messages through the SDI)

e-invoicing process high level overview

sequenceDiagram
    Supplier->>Supplier: prepares and signs E-INVOICE
    Supplier->>SDI: sends signed E-INVOICE
    SDI->>SDI: verifies E-INVOICE and create metadata
    SDI->>Buyer: sends E-INVOICE and metadata
    SDI->>SDI: prepare and signs RECEIPT OF FILE DELIVERY TO RECIPIENT
    SDI-->>Supplier: sends RECEIPT OF FILE DELIVERY TO RECIPIENT
    Buyer->>Buyer: E-INVOICE formal and busness internal cheks
    Buyer->>SDI: senda CUSTOMER NOTIFICATION OF OUTCOME (acceptance or rejection)
    SDI->>Supplier: senda CUSTOMER NOTIFICATION OF OUTCOME

type of messages and formats:

E-INVOICE and metadata

B2B E-INVOICEs are XML files complying to the "FatturaPA" format and always requires Qualified Electronic Signature.

The Signature may of two alternative types:

  • (XAdES) XML Signature (the signature is included in the XML)
  • (PAdES) P7M Signature (the signsture is external to the file and both the file and the signature are wrapped in a mime-type envelope)

notifications

notifications are xml files complying to the Data Exchange System Specigifations

Notifications types that are relevant for platform-d are:

  • RECEIPT OF FILE DELIVERY TO RECIPIENT (see par. 1.2 of the specs): attests the succesfull delivery of the E-INVOICE to the buyer. It includes a digital signature by the SDI.
  • CUSTOMER NOTIFICATION OF OUTCOME (see par. 1.5 specs): attests the formal acceptance or rejection of the E-INVOICE.

E-INVOICE examples

ToDos

  • add the case where the outcome isn't receinved: in this case the time ut notification is mandatory (in order to avoid a negative result, hidden by the supplier plus forgery of buyer identity)
  • add another type of notification as required (in case of lacking of the outcome)
  • if either the outcome or the timeout notificaiton aren't presented by the supplier, the notarisation cannot proceed
  • add checking via AISP account that the e.invoice hasn't been paied at time of notarisation and negotiation