GSA , deputizing for carriers which we represent, on behalf of shipper or consignee may, but shall not be obligated to, comply with the formalities required by customs and other Government authorities. Shipper is obligated to comply with all customs regulations and other governmental regulations. Shipper, consignee and owner of goods shall be jointly and severally liable to GSA  for advance any duties, taxes, other charges or reimburse of any payment made.