GST refund applications by UN agencies and diplomatic missions require a standard form with tax breakdown, bank details, and verification. The refund application requires the applicant's UIN, name, address, tax period and a detailed refund amount breakdown (Central, State/UT, Integrated Tax and Cess), together with complete bank account details (account number, type, bank name, account holder, branch address, IFSC and MICR). The form also requires the claim period and amount, reference to GSTR-11, and a verification by an authorised representative affirming eligibility as a specified agency of the UN, multilateral financial institutions, consulates, embassies or other notified foreign entities, with name, designation, signature and date.