diff --git a/classes/events.php b/classes/events.php
index 5dfb0cf..33e278b 100644
--- a/classes/events.php
+++ b/classes/events.php
@@ -59,13 +59,29 @@ class events {
 
         if ($callbacks->valid()) {
             foreach ($callbacks as $callback) {
-                self::send($data, $callback);
+                self::handler_callback($data, $callback);
             }
         }
 
         $callbacks->close();
     }
 
+    /**
+     * Processes each callback.
+     *
+     * @param array $data
+     * @param object $callback
+     */
+    private static function handler_callback($data, $callback) {
+        if ($callback->enable) {
+            $events = unserialize(gzuncompress(base64_decode($callback->events)));
+
+            if (boolval($events[$data["eventname"]])) {
+                self::send($data, $callback);
+            }
+        }
+    }
+
     /**
      * Sending data to the node.
      *
@@ -73,11 +89,9 @@ class events {
      * @param object $callback
      */
     private static function send($data, $callback) {
-        if ($callback->enable) {
-            $curl = new curl();
-            $package = self::packup($data);
-            $curl::request($callback->url, $package);
-        }
+        $curl = new curl();
+        $package = self::packup($data);
+        $curl::request($callback->url, $package);
     }
 
     /**
diff --git a/classes/forms.php b/classes/forms.php
index c95b280..d6402cc 100644
--- a/classes/forms.php
+++ b/classes/forms.php
@@ -28,6 +28,7 @@ defined("MOODLE_INTERNAL") || die();
 
 require_once($CFG->libdir . "/formslib.php");
 
+use report_eventlist_list_generator;
 use lang_string;
 use moodleform;
 
@@ -45,6 +46,16 @@ class service_edit_form extends moodleform {
         parent::__construct($baseurl);
     }
 
+    /**
+     * Unpacks data for display.
+     *
+     * @param object $record
+     */
+    public function set_data($record) {
+        $record->events = unserialize(gzuncompress(base64_decode($record->events)));
+        return parent::set_data($record);
+    }
+
     /**
      * Defines the standard structure of the form.
      */
@@ -76,6 +87,25 @@ class service_edit_form extends moodleform {
         $mform->setDefault("enable", 1);
         $mform->setAdvanced("enable");
 
+        /* Form heading */
+        $mform->addElement("header", "editserviceheaderevent",
+            new lang_string("edulevel", "moodle"));
+
+        /* List of events */
+        $eventlist = report_eventlist_list_generator::get_all_events_list(true);
+        $events = array();
+
+        /* Formation of the list of elements */
+        foreach ($eventlist as $event) {
+            $events[$event["component"]][] =&
+                $mform->createElement("advcheckbox", $event["eventname"], $event["eventname"]);
+        }
+
+        /* Displays groups of items */
+        foreach ($events as $key => $event) {
+            $mform->addGroup($event, "events", $key, "<br />", true);
+        }
+
         /* Control Panel */
         $this->add_action_buttons(true);
     }
diff --git a/db/install.xml b/db/install.xml
index b152933..f2e5b05 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="blocks/local_webhooks/db" VERSION="20171022" COMMENT="XMLDB file for Moodle" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd">
+<XMLDB PATH="blocks/local_webhooks/db" VERSION="20171025" COMMENT="XMLDB file for Moodle" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd">
     <TABLES>
         <TABLE NAME="local_webhooks_service" COMMENT="A table for storing callback services.">
             <FIELDS>
@@ -7,6 +7,7 @@
                 <FIELD NAME="enable" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" />
                 <FIELD NAME="title" TYPE="text" NOTNULL="true" SEQUENCE="false" />
                 <FIELD NAME="url" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" />
+                <FIELD NAME="events" TYPE="text" NOTNULL="true" SEQUENCE="false" />
             </FIELDS>
             <KEYS>
                 <KEY NAME="primary" TYPE="primary" FIELDS="id" />
diff --git a/editservice.php b/editservice.php
index e9c053c..427332c 100644
--- a/editservice.php
+++ b/editservice.php
@@ -63,6 +63,9 @@ if ($data = $mform->get_data()) {
         $data->enable = 0;
     }
 
+    /* Packing of data */
+    $data->events = base64_encode(gzcompress(serialize($data->events), 9));
+
     if ($idediting) {
         $data->id = $idservice;
         $DB->update_record("local_webhooks_service", $data);