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How do I get a Tax Exemption Certificate for export from the US if I am in another country?
Depends on the state, in Texas you should charge sales tax because the shipment is going to a freight forwarder in Texas.  That being said, once you have the bill of lading you can have your tax credited by the vendor.  It is one of the documents the state will except in lieu of sales tax for exports.  There are five.  You can find this info at the Comptrollers website. I would validate that you are being charged sales/use tax and not withholding tax, withholding would be related to your country. Doc requirements for export vary from state to state.