U.S. Commercial Service Houston offers export help to small- and medium-sized U.S. businesses that helps them expand internationally. The purpose of the CISG is to provide a modern, uniform and fair regime for contracts for the international sale of goods.Importing Into the United States provides wide-ranging information about the importing process and import requirements. The Embassy plans to award a purchase order. You are encouraged to make your quotation competitive. This Contract shall be construed and interpreted in accordance with the applicable laws of the State of Texas and City of Houston. Yes. Texas sales tax is due when your customer picks up or takes delivery of a taxable item in Texas. You can refund the tax collected to your customer. CTPAT Partners enjoy a variety of benefits, including taking an active role in working closer with the US Government in its war against terrorism. U.S. participation in the global economy.