public static function create_contact_request(int $userid, int $requesteduserid) : \stdClass {
        global $DB, $PAGE;

        $request = new \stdClass();
        $request->userid = $userid;
        $request->requesteduserid = $requesteduserid;
        $request->timecreated = time();

        $request->id = $DB->insert_record('message_contact_requests', $request);

        // Send a notification.
        $userfrom = \core_user::get_user($userid);
        $userfromfullname = fullname($userfrom);
        $userto = \core_user::get_user($requesteduserid);
        $url = new \moodle_url('/message/pendingcontactrequests.php');

        $subject = get_string('messagecontactrequestsnotificationsubject', 'core_message', $userfromfullname);
        $fullmessage = get_string('messagecontactrequestsnotification', 'core_message', $userfromfullname);

        $message = new \core\message\message();
        $message->courseid = SITEID;
        $message->component = 'moodle';
        $message->name = 'messagecontactrequests';
        $message->notification = 1;
        $message->userfrom = $userfrom;
        $message->userto = $userto;
        $message->subject = $subject;
        $message->fullmessage = text_to_html($fullmessage);
        $message->fullmessageformat = FORMAT_HTML;
        $message->fullmessagehtml = $fullmessage;
        $message->smallmessage = '';
        $message->contexturl = $url->out(false);
        $userpicture = new \user_picture($userfrom);
        $userpicture->includetoken = $userto->id; // Generate an out-of-session token for the user receiving the message.
        $message->customdata = [
            'notificationiconurl' => $userpicture->get_url($PAGE)->out(false),
            'actionbuttons' => [
                'accept' => get_string_manager()->get_string('accept', 'moodle', null, $userto->lang),
                'reject' => get_string_manager()->get_string('reject', 'moodle', null, $userto->lang),
            ],
        ];

        message_send($message);

        return $request;
    }