The website states -
"The Travel Pass may be purchased online by clicking the blue button above. You will be sent a receipt by email, which can then be exchanged for the ticket itself, at the Madrid Metro Customer Service Desk ("Centro de Atención al Cliente", open every day from 7am to 10pm) just outside the Metro Station in Madrid Airport's Terminal 2, or at the tourist office in Plaza Mayor."
The link sends me to the http://www.neoturismo.com site. Is this a legit site? Ideally, I would like to buy the card and already travel to the centre on the card, thus starting to realise the discount. Thank you