Electronic Credit Ledger governs credit maintenance, debits for GST liability discharge, and re crediting of refunds. Rule 86 requires maintenance of the Electronic Credit Ledger in FORM GST PMT-02 where input tax credit claims are credited; the ledger is debited on discharge of liabilities and for refund claims, with rejected or admissible wrongly paid refunds re-credited by the proper officer through prescribed forms. Direct entries are prohibited except as authorised, and registrants must report discrepancies to the jurisdictional officer via FORM GST PMT-04; a refund is deemed rejected if an appeal is finally dismissed or the claimant undertakes not to appeal.