If you're a foreign resident in Spain you can also show your tarjeta de identidad de extranjero or TIE. These details are required by the Spanish authorities and Airbnb hosts or hoteliers are obliged to complete a guest registration.
...the law does not require the establishment to send a photograph or scan to the authorities, only the necessary data. The Spanish Data Protection Agency (AEPD) states that making a copy of these documents is actually illegal.
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