diff --git a/classes/handler.php b/classes/handler.php
index f8a0a2e..fec44a2 100644
--- a/classes/handler.php
+++ b/classes/handler.php
@@ -24,18 +24,6 @@
 
 namespace local_webhooks;
 
-defined('MOODLE_INTERNAL') || die();
-
-global $CFG;
-
-require_once(__DIR__ . '/../lib.php');
-require_once(__DIR__ . '/../locallib.php');
-
-require_once($CFG->libdir . '/filelib.php');
-
-use curl;
-use local_webhooks_events;
-
 /**
  * Defines how to work with events.
  *
@@ -47,61 +35,8 @@ class handler {
      * External handler.
      *
      * @param object $event
-     *
-     * @throws \dml_exception
-     * @throws \coding_exception
      */
-    public static function events($event) {
-        $data = $event->get_data();
-
-        if (!empty($callbacks = local_webhooks_get_list_records())) {
-            foreach ($callbacks as $callback) {
-                self::handler_callback($data, $callback);
-            }
-        }
-    }
-
-    /**
-     * Processes each callback.
-     *
-     * @param array  $data
-     * @param object $callback
-     *
-     * @throws \coding_exception
-     * @throws \dml_exception
-     */
-    private static function handler_callback($data, $callback) {
-        global $CFG;
-
-        if ((bool) $callback->enable && !empty($callback->events[$data['eventname']])) {
-            $urlparse = parse_url($CFG->wwwroot);
-
-            $data['host'] = $urlparse['host'];
-            $data['token'] = $callback->token;
-            $data['extra'] = $callback->other;
-
-            self::send($data, $callback);
-        }
-    }
-
-    /**
-     * Sending data to the node.
-     *
-     * @param array  $data
-     * @param object $callback
-     *
-     * @return array
-     * @throws \coding_exception
-     * @throws \dml_exception
-     */
-    private static function send($data, $callback) {
-        $curl = new curl();
-        $curl->setHeader(['Content-Type: application/' . $callback->type]);
-        $curl->post($callback->url, json_encode($data));
-
-        $response = $curl->getResponse();
-        local_webhooks_events::response_answer($callback->id, $response);
-
-        return $response;
+    public static function events($event): void {
+        // Delivery remains disabled until events can be persisted before any network request.
     }
 }
diff --git a/tests/handler_test.php b/tests/handler_test.php
new file mode 100644
index 0000000..1756d55
--- /dev/null
+++ b/tests/handler_test.php
@@ -0,0 +1,77 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Event handler tests.
+ *
+ * @package   local_webhooks
+ * @copyright 2026 "Valentin Popov" <info@valentineus.link>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace local_webhooks;
+
+/**
+ * Event handler tests.
+ */
+#[\PHPUnit\Framework\Attributes\CoversClass(handler::class)]
+final class handler_test extends \advanced_testcase {
+    /**
+     * The legacy observer does not inspect or deliver events.
+     */
+    public function test_legacy_delivery_is_disabled(): void {
+        global $CFG;
+
+        $this->resetAfterTest();
+
+        $event = new class {
+            /** @var bool Whether event data was requested. */
+            public bool $accessed = false;
+
+            /**
+             * Fails if the disabled handler reads the event.
+             *
+             * @return array
+             */
+            public function get_data(): array {
+                $this->accessed = true;
+                throw new \LogicException('The disabled handler must not read event data.');
+            }
+        };
+
+        handler::events($event);
+        $this->assertFalse($event->accessed);
+
+        $user = $this->getDataGenerator()->create_user();
+        $coreevent = \core\event\user_created::create([
+            'objectid' => $user->id,
+            'context' => \context_user::instance($user->id),
+        ]);
+        $sink = $this->redirectEvents();
+        $debug = $CFG->debug;
+
+        try {
+            $CFG->debug = DEBUG_DEVELOPER;
+            handler::events($coreevent);
+        } finally {
+            $CFG->debug = $debug;
+        }
+
+        $events = $sink->get_events();
+        $sink->close();
+        $this->assertEmpty($events);
+    }
+}