Select "Electronic 3c Invoice" as the invoice type. Electronic 3c invoice belongs to VAT electronic invoice, which is a receipt and payment voucher in the form of data message issued or collected in business activities, that is, electronic invoice. Electronic invoice is the product of the information age. Like the ordinary invoice structure, it is distributed to merchants by the tax bureau in the form of unified distribution. Its legal effect, basic use and basic use provisions are the same as those of the VAT invoice supervised by the tax authorities. Electronic invoices generally exist in the form of PDF files, which taxpayers can download and store in other electronic storage devices such as mobile phones and USB flash drives.