Ticket sales are handled by Notikumi. In almost every case, the solution is to email entradas@notikumi.com with these details:

I didn't receive any email after buying. Email Notikumi with the details above.

I lost the confirmation email. You can see your tickets in the Buyer's Portal with your email and booking reference (locator). If you can't log in, email Notikumi and they will send you a copy.

I have the email but can't find my ticket. Your ticket is the attached file "ticket.pdf", which opens with any PDF reader. It is also always available in the Buyer's Portal. To enter the festival, show it printed or on your phone screen.

I entered the wrong email when buying. Email Notikumi with the details above and your correct address.

Where is my booking reference (locator)? At the top right of your ticket, just below the QR code.

The system won't accept my card. Try the purchase again, reading the on-screen information carefully and checking whether your bank opens an extra verification window (SMS code, your bank's app…). If it still doesn't work, try from another device (computer, phone or tablet) or with a different card.