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The Spanish Patent and Trademark Office's Electronic Register service requires:

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To make a payment via AEAT (Spanish State Tax Administration Agency), you must be in possession of a digital DNI or other certificate (see instructions for importing certificates) issued in compliance with ITU recommendation X.509.V3 (ISO/IEC 9594-8 of 1997 or later) by a Certification Services Provider which supports advanced electronic signatures and is recognised by the Public Administration (click here to see the list of certification service providers recognised by the @firma platform).

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