In addition, the competent tax authorities should confirm the types, quantities and methods of receiving and purchasing invoices according to the business scope and scale of the receiving and purchasing units and individuals, and issue an invoice receiving and purchasing book within 5 working days. Article 15 of the Measures for the Administration of Invoices in People's Republic of China (PRC) shall collect and purchase invoices from the competent tax authorities on the basis of the tax registration certificate, the identity certificate of the agent and the stamp of the special seal for invoices printed according to the style specified by the competent tax authorities in the State Council. The competent tax authorities shall, according to the business scope and scale of purchasing units and individuals, confirm the types, quantities and methods of purchasing invoices, and issue invoice purchasing books within 5 working days.