If the invalid tickets are self-opened, they can't be found online, but only in the billing system. There are two ways to check whether the invoice issued by the other party is invalid:

If you want to know whether the invoice seller issued in the current month has been invalidated, you can only call directly to inquire about the seller's finance, just press the phone number on the invoice, because the invoice enterprise in the current month has not yet obtained the tax return from the tax bureau, so the tax bureau does not know.

If it is beyond the month of billing, go directly to the tax bureau to ask, even if you don't ask, the tax bureau will come to you, because it is connected to the national network.

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