Modify strictly enabled cookie categories using - WebToffee GDPR Cookie Consent plugin

functions.php

function webtoffee_strictly_enabled_cookie_categories($strict_categories) {

    $count = count($strict_categories);
    $strict_categories[$count] = 'skroutz';
    $strict_categories[$count+1] = 'pixel';

    return $strict_categories;
}

add_filter('gdpr_strictly_enabled_category', 'webtoffee_strictly_enabled_cookie_categories');