Some large stores issue invoices.

The failure to issue an invoice proves that this store has a tax evasion problem. If you must open it, it is better to choose another store.

It’s still a question of paying taxes. They have to pay taxes if an invoice is issued, but they don’t have to pay if they don’t.

As long as you have a warranty card, you can carry out warranty within the warranty period even without an invoice. If you have to specify that all invoices must be covered by joint warranty, you have to go back to the place of purchase and ask the merchant to help you carry out joint warranty.