E-invoices — the B2B invoice is registered with the IRP and carries its signed code
Above ₹5 crore a B2B invoice is registered with the Invoice Registration Portal the moment it closes; the IRN, acknowledgement and signed QR come back and print on the invoice; cancel within 24 hours, else a credit note.
Menu → Tax → E-invoices. Once the registration's e-invoice date is set (Registrations), every B2B invoice — a folio closed to a payer with a GSTIN, a restaurant bill to a registered guest, a credit or debit note against one — is queued when it closes. A timer sends it to the IRP through the GSP you have set up (*NIC directly* or *ClearTax*, credentials under the app's vault key) and writes back the IRN, the acknowledgement number and date, and the signed QR; the invoice page prints them. A B2C invoice is never sent. Failed is retried five times with a longer wait each time, then waits for you: read the IRP's words in the row, correct what it names (a buyer's pin code, a GSTIN that lapsed), and *Retry*. Cancel within 24 hours of the acknowledgement with the IRP's reason code; after that the IRP refuses and so does this page — issue a credit note, which is itself registered. At risk lists invoices over twenty days old still unregistered: above ₹10 crore the IRP refuses one older than thirty.