Go directly to the tax hall. Export invoice refers to the sales certificate of export products of export enterprises. That is, the delivery price list issued to the importer is the general certificate of goods delivery, the certificate of settlement and customs declaration for buyers and sellers, and one of the audit certificates of tax authorities for export tax refund. Go directly to the tax hall to provide electronic invoicing data and invoice inspection summary signed by the purchaser (this form is filled in by the invoice cancellation post of the tax service office).