You can't. Because the purchase and issuance of invoices are supervised and managed by the tax authorities, if you need to purchase invoices, you need to apply to the competent tax authorities, and you can only purchase invoices after approval. At the same time, the tax bureau also collects taxes according to the taxpayer's declaration, and the declared tax already includes the income that needs to be invoiced, so the tax bureau will also issue corresponding invoices for taxpayers.