In den Einreiseregeln auf der o.a. Seite steht speziell bei Deutschland folgende aktuell gültige Regelung (gibts leider nur auf spanisch und englisch):
„Germany
Health requirements to pass health control at point of entry into SpainPassengers arriving in Spain by air or sea, including those arriving in transit to other countries, must complete a Health Control Form before departure and obtain their QR to present at boarding and health controls on arrival in Spain. You can find more information on the website https://spth.gob.es
In addition to the Health Control Form, passengers must present a certificate or document proving vaccination against COVID-19 or a negative certificate of a Diagnostic Test of Active Infection or a certificate of Recovery after having passed this disease. These certificates will be different if they have been issued in a European Union country (EU Digital COVID Certificate) or in a third country. Children under 12 years of age are exempt from presenting these certificates.“
Man findet die aktuellen speziellen Regeln für jedes Land weltweit über die Landkarte.