Right to appeal available to any person aggrieved by adjudicating authority decisions, subject to specified non-appealable orders. Any person aggrieved by an order or decision under the GST framework has a statutory right to appeal if the order was passed by an adjudicating authority; however, certain categories of decisions or orders are expressly excluded from appeal as non-appealable, and the appealability depends on the statute's delineation of adjudicating authorities and specified exceptions.