function is_wp_org_free_version() {
    return function_exists('tpt_fs') && !tpt_fs()->is_premium();
}

// Check if free version from https://wordpress.org/ activated
function wcfm_wc_tiered_price_table_active_check() {
    $active_plugins = (array) get_option('active_plugins', array());

    $free_plugin_main_file = 'tier-pricing-table/tier-pricing-table.php';

    $found_plugin_folder = (
        in_array($free_plugin_main_file, $active_plugins) ||
        array_key_exists($free_plugin_main_file, $active_plugins)
    );

    return $found_plugin_folder && is_wp_org_free_version();
}

// Check if the premium version from https://woocommerce.com/ activated
// Or, if the premium version from https://u2code.com/ activated
function wcfm_wc_tiered_price_table_premium_active_check() {
    $active_plugins = (array) get_option('active_plugins', array());

    // from woocommerce
    $free_plugin_main_file = 'tier-pricing-table/tier-pricing-table.php';

    // from u2code
    $premium_plugin_main_file = 'tier-pricing-table-premium/tier-pricing-table.php';

    $found_plugin_folder = (
        in_array($free_plugin_main_file, $active_plugins) ||
        array_key_exists($free_plugin_main_file, $active_plugins)
    ) || (
        in_array($premium_plugin_main_file, $active_plugins) ||
        array_key_exists($premium_plugin_main_file, $active_plugins)
    );

    return $found_plugin_folder && !is_wp_org_free_version();
}