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// add additional fee in woocommerce
add_action('woocommerce_cart_calculate_fees', function() {
if (is_admin() && !defined('DOING_AJAX')) {
return;
}
// i have used dynamic value you can also use static value like
//$outcum = 100;
$outcum = get_option('woocommerce_store_fees');
WC()->cart->add_fee('Additional Fee', $outcum);
});
// add additional fee in woocommerce