IGST refund facilitation: permanent officer interface allows SB-005 invoice corrections to unblock refunds, subject to a payable fee. Exporters may correct SB-005 invoice mismatch errors for all past shipping bills via the Officer Interface to resolve IGST refund holds, subject to a specified fee and following procedures in prior circulars; this facility is now made available on a permanent basis and the Levy of Fee (Customs Documents) Regulations, 1970 amended by Notification No.17/2021 to reflect the fee.