in externallib.php [49:57]
protected static function validate_feedback_onenote_delete_foruser($contextid, $gradeid, $userid) {
global $DB;
// Request and permission validation.
$assign = $DB->get_record('assignfeedback_onenote', ['id' => $gradeid], 'id', MUST_EXIST);
$user = $DB->get_record('user', ['id' => $userid], 'id', MUST_EXIST);
return [$contextid, $gradeid, $userid];
}