INV-01 and IRN
Every mandatory field checked before transmission; idempotent so a retry never becomes a second report.
e-Invoicing and e-way bills
Register invoices with the IRP and move goods legally.
Signed QR
The IRP's signed QR read directly — exact GSTINs, number, date, IRN and total — for the fast path into the books.
Cancellation
Within the 24-hour window; afterwards the product says to reverse with a credit note.
e-Way bills
Thresholds by state, validity by distance, Part A and Part B kept apart, the 180- and 360-day limits enforced.