Implement simple csrf token into ajax driven forms

public/typo3conf/ext/ep_events/Classes/Domain/Model/Inquiry.php

@@ -31,6 +31,13 @@ use TYPO3\CMS\Extbase\DomainObject\AbstractValueObject;
 
 class Inquiry extends AbstractValueObject
 {
+    public const TOKEN_KEY = 'inquiry_form';
+
+    /**
+     * @var string
+     */
+    protected $token;
+
     /**
      * @var string
      */
@@ -203,6 +210,22 @@ class Inquiry extends AbstractValueObject
         return $inquiry;
     }
 
+    /**
+     * @return string
+     */
+    public function getToken()
+    {
+        return $this->token;
+    }
+
+    /**
+     * @param string $token
+     */
+    public function setToken(string $token)
+    {
+        $this->token = $token;
+    }
+
     /**
      * @return string
      */