All the services available in the airport
In Spain, the entire VAT refund process for travellers is digital, through using he DIVA system:
Using the DIVA screens
No physical document is issued with the validation result. You can check the status of the process using the CSV (secure verification code) number on the form by accessing: https://www.agenciatributaria.gob.es/AEAT.sede/tramitacion/ZZ05.shtml
Once the validation has been confirmed on the screen or at the office, you can obtain the refund directly at the Tax Free offices in the boarding areas.
Requirements for requesting a VAT refund
If you cannot validate the tax-free DIVA form on the screens, you must show the documentation and goods to the officers at the Civil Guard’s receipt stamping office.