Two. Official website, the tax bureau, inquired that there was a special financial seal and an invoice. The invoice issued must have the special invoice seal or financial seal of the issuing unit, otherwise it will be invalid. One chapter belongs to the tax bureau, which proves that this is an invoice purchased from the tax bureau and also refers to the special seal for enterprise invoices. Therefore, the invoice of Shenzhen Guanling Law Firm should be stamped with two seals.