No woocommerce, adicionei um campo de texto extra antes do botão Adicionar ao carrinho para adicionar cobranças personalizadas na compra do produto.

Este plug-in adicionará um campo de texto extra à página de um único produto e calcula o total mais a taxa extra.

Meu problema é que não posso adicionar totais de carrinho personalizados e a taxa extra é adicionada antes dos totais

eu tenteiwoocommerce_cart_calculate_fees mas sem sorte, só mostra$0 em totais

Código PHP:

 /**
 * Check if woocommerce is active and or installed.
 */

if ( class_exists( 'WooCommerce' ) || in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) || function_exists( 'WC' ) && is_object( WC() ) && is_a( WC(), 'WooCommerce' )  )
{

/**
 * Style and Ajax script.
 */
    add_action('woocommerce_single_product_summary','extra_enqueue_scripts');

        function  extra_enqueue_scripts()
        {
            wp_enqueue_style('custom_style', plugins_url('/assets/css/custom_style.css', __FILE__));

            wp_register_script( 'item_add', plugins_url('/assets/js/item_add.js', __FILE__), array('jquery'), false, true ); 
            wp_enqueue_script('item_add'); 

            $array_to_be_sent = array( 'ajax_file_path' => admin_url('admin-ajax.php')); 

            wp_localize_script( 'item_add', 'wdm_object', $array_to_be_sent);

        }


/**
 * Add Text field Before add to cart button.
 */     

    add_action( 'woocommerce_before_add_to_cart_button', 'extra_add_custom_field', 0 );

        function extra_add_custom_field() 
        {
          $currency = get_woocommerce_currency_symbol();
          echo "<div class='custom-text text'><p>Extra Charge ($currency):</p>
          <input type='text' name='custom_price' value='' placeholder='e.g. 10' title='Custom Text' class='custom_price text_custom text'></div>";

        } 

/**
 * Add ajax callback function to get data
 * and add that data to session.
 */             

    add_action('wp_ajax_extra_add_user_custom_data_options_callback', 'extra_add_user_custom_data_options_callback');
    add_action('wp_ajax_nopriv_extra_add_user_custom_data_options_callback', 'extra_add_user_custom_data_options_callback');

        function extra_add_user_custom_data_options_callback()
        {
          $user_custom_data_values = (float)sanitize_text_field($_POST['custom_price']);
          session_start();
          $_SESSION['user_custom_data'] = $user_custom_data_values;
          die();
        }


/**
 * Add data to cart from session and then destroy session.
 */ 

    add_filter('woocommerce_add_cart_item_data','extra_add_custom_field_data',1,2);

        function extra_add_custom_field_data($cart_item_data,$product_id)
        {
            global $woocommerce;
            session_start();    
            if (isset($_SESSION['user_custom_data'])) 
            {
                $option    = $_SESSION['user_custom_data'];       
                $new_value = array('user_custom_data_value' => $option);
            }
            if(empty($option))
            {               
                return $cart_item_data;
            }
            else
            {    
                if(empty($cart_item_data))
                {
                    return $new_value;
                }
                else
                {
                    return array_merge($cart_item_data,$new_value);
                }
            }
            unset($_SESSION['user_custom_data']); 
        }


/**
 * Derive cart Item from session.
 */         

    add_filter('woocommerce_get_cart_item_from_session', 'extra_get_cart_items_from_session', 1, 3 );

        function extra_get_cart_items_from_session($item,$values,$key)
        {
            if (array_key_exists( 'user_custom_data_value', $values ) )
            {
                $item['user_custom_data_value'] = $values['user_custom_data_value'];
            }       
            return $item;
        }

/** 
 * Add extra price into product regular price.
 * Calculate extra price before checkout.
 */         

    add_action( 'woocommerce_before_calculate_totals', 'extra_price_add_custom_price' );

        function extra_price_add_custom_price( $cart_object ) 
        {   
          foreach ( $cart_object->get_cart() as $hash => $value )       
          { 
            if(!empty($value['user_custom_data_value']) && $value['data']->is_on_sale())
            {   
                $newprice = $value['data']->get_sale_price() + $value['user_custom_data_value'];
                $value['data']->set_price((float)( $newprice ));
            }
            elseif(!empty($value['user_custom_data_value']))
            {
                $newprice = $value['data']->get_regular_price() + $value['user_custom_data_value'];
                $value['data']->set_price((float)( $newprice ));
            }
          }
        }


/**
 * Render extra charge in cart table.
 */         

    add_filter('woocommerce_checkout_cart_item_quantity','extra_add_user_custom_option_from_session_into_cart',1,3); 
    add_filter('woocommerce_cart_item_price','extra_add_user_custom_option_from_session_into_cart',1,3);

        function extra_add_user_custom_option_from_session_into_cart($product_name, $values, $cart_item_key )
        {
            if(count($values['user_custom_data_value']) > 0)
            {
                $currency      = get_woocommerce_currency_symbol();
                $product_price = wc_get_product( $values['product_id'] );
                if($product_price->is_on_sale())
                {
                    $price = $product_price->get_sale_price().'&nbsp;(On Sale!)';
                }
                else
                {
                    $price = $product_price->get_regular_price();
                }

                $custom_items  = $currency.$price."<br>";
                $custom_items .= $currency.$values['user_custom_data_value'].'&nbsp;';
                $custom_items .= __("Extra Charge", "woocommerce" );
                return $custom_items;
            }
            else
            {
                return $product_name;
            }
        }

/**
 * Remove custom data if quantity is zero.
 */ 

    add_action('woocommerce_before_cart_item_quantity_zero','extra_remove_user_custom_data_options_from_cart',1,1);

        function extra_remove_user_custom_data_options_from_cart($cart_item_key)
        {
            global $woocommerce;
            $cart = $woocommerce->cart->get_cart();
            foreach( $cart as $key => $values)
            {
                if ( $values['user_custom_data_value'] == $cart_item_key )
                {
                    unset( $woocommerce->cart->cart_contents[ $key ] );
                }
            }
        }       



/**
 * Add custom data to order meta after checkout.
 */ 

     add_action('woocommerce_add_order_item_meta','extra_add_values_to_order_item_meta',1,2);

        function extra_add_values_to_order_item_meta($item_id, $values)
        {
            global $woocommerce,$wpdb;
            $user_custom_values = $values['user_custom_data_value'];
            if(!empty($user_custom_values))
            {
                $currency = get_woocommerce_currency_symbol();
                wc_add_order_item_meta($item_id,'Extra Charge',$currency.$user_custom_values);  
            }
        }
} 

else 

{

/**
 * Generate error notice if woocommerce is not detected.
 */ 

    add_action( 'admin_notices', 'extra_no_woocommerce' );

        function extra_no_woocommerce()
        {
            $err_text = site_url()."/wp-admin/plugin-install.php?tab=plugin-information&plugin=woocommerce&TB_iframe=true";
            ?>
            <div class="error notice">
            <p><?php echo sprintf("Please Activate or <a href='%s' style='color:green;'>Install Woocommerce</a> to use extra field for product charge plugin",$err_text); ?></p>
            </div>
           <?php
        }
}

JS Código

jQuery(document).ready(function(){
        jQuery('.single_add_to_cart_button').click(function(){
          jQuery.ajax({
                    url: wdm_object.ajax_file_path,
                    type: "POST",
                    data: {
                            action:'add_user_custom_data_options_callback', 
                            custom_price : jQuery('.custom_price').val()
                          },
                    async : false,
                    success: function(data){
                        jQuery('.single_add_to_cart_button').text('Added to cart');
                    }
                });
 })
 });