Excuse me, why is there no official seal on the electronic invoice I printed?
The format file of the VAT electronic invoice already contains the electronic signature, and the signature is the special seal for the tax filing invoice of Shandong Unicom, which conforms to the national electronic signature law. If the invoice format file you open does not show the electronic signature, it may be caused by opening it directly with a browser. You can download PDF reading software with high praise rate on your mobile phone or computer terminal and then open it.