Appeal to Appellate Authority under GST law: structured application and particulars required for contesting tax demands. Application to the Appellate Authority under sub section (2) of Section 107 is a prescribed form requiring appellant identification, GSTIN/Temporary ID/UIN, details of the impugned order and officer, statement of facts, grounds of appeal and prayer, description and classification of goods/services and disputed period. It mandates a structured financial disclosure showing amounts created and amounts under dispute across Central tax, State/UT tax, Integrated tax and Cess and across Tax/Cess, Interest, Penalty, Fees and Other charges, and requires place, date, signature, designation and jurisdiction of the applicant officer.