IGST refund process for invoice mismatches: new officer-interface mechanism to expedite pending export refund claims. Refund of IGST on export consignments affected by invoice mismatches: Public Notice establishes an alternative mechanism with officer interface, prescribes submission of a Concordance Table via a dedicated electronic channel, and designates a dedicated cell headed by an Assistant Commissioner to receive and vet concordance submissions and related claims to expedite processing of refund claims pending due to invoice-related errors.