Could you tell me about the process of export tax rebate?

first, collect all the information of tax refund, including VAT invoice, commercial invoice, packing list, purchase and sale contract, delivery note or delivery note of the manufacturer, verification note, export tax refund copy of customs declaration, foreign exchange collection and sales copy, release note (by sea) or six copies (by land). Note that the VAT invoice must be certified, and then take these materials to the IRS for refund.