The Araba, Bizkaia and Gipuzkoa tax administrations provide systems for checking the QR code, which must be printed on invoices and receipts.
Araba: https://ticketbai.araba.eus/TBAI/QRTBAI
Bizkaia: https://batuz.eus/QRTBAI/
Gipuzkoa: https://tbai.egoitza.gipuzkoa.eus/qr/
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