Buy-back fee obligation requires merchant bankers to pay tiered fees on filing offer documents, payable through specified electronic modes. Merchant bankers submitting offer documents or public announcements under the Buy-back Regulations must pay prescribed fees to the Board calculated under a three-tier schedule linked to offer size: a fixed fee for the smallest tier, a percentage for mid-sized offers, and a fixed plus percentage for amounts above the largest threshold. Fees are payable by electronic transfer or other modes as specified by the Board, and the schedule includes notes recording a temporary reduced-fee regime and later amendments to payment modalities.