Product Total price on cart page

This plug-in does what it says in their description without any error.

But i am trying to add an extra fee on user input

Issues: when i disable the plug-in it works fine but if i enable the plug-in i am not able to update the total price of each product on cart page.

can you please guide in this matter or the hook you are using to modify the price.

<code>
// Set the new calculated cart item price
add_action( 'woocommerce_before_calculate_totals', 'extra_price_add_custom_price', 999, 1 );
function extra_price_add_custom_price( $cart ) {
	if ( is_admin() && !defined('DOING_AJAX') )
		return;

	foreach ( $cart->get_cart() as $cart_item ) {
		if( isset($cart_item['custom_data']['new_price']) ){
			$cart_item['custom_data']['new_price'];
			$cart_item['data']->set_price( floatval($cart_item['custom_data']['new_price']) );
		
		}
	}
}

</code>