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e-invoicing
SdI (Sistema di Interscambio)
The Agenzia delle Entrate clearance hub that validates, registers, and routes every FatturaPA between Italian sellers and buyers, returning the ricevuta di consegna on success or a ricevuta di scarto with an error code on rejection.
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SdI is the canonical European example of a clearance-style continuous-transaction-controls regime alongside Hungary RTIR and Spain TicketBAI/Veri*Factu. It accepts submissions via SDICoop web service, PEC, SDIFTP, or accredited intermediary, validates against the FatturaPA schematron, and forwards the document to the buyer via the Codice Destinatario or PEC fallback.
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