Woocommerce - Product price depending on country

Question

I have 2 questions regarding Woocommerce for Wordpress.

I\'m working on a site that sells speakers to the Danish market.

Question one:

Answer 1

For the 2nd part of your question: If you are only using simple product types (without variations) then you can add custom price fields to the product data page and filter the price using woocommerce_get_price_html.

add_filter('woocommerce_get_price_html','so24863612_custom_price');
function so24863612_custom_price(){
   global $post;
   $_postID = $post->ID;
   $product = get_product( $_postID );
   $UK_price = get_post_meta($_postID, '_UK_price', true); //loads custom meta data 
   $return_price = $product->get_regular_price(); //default to regular price
   if (!empty($UK_price)) { 
      $return_price = $UK_price;
   }
   return $return_price;
}

You can create and save custom fields on the product page like this:

//Display custom fields on product data page in admin
add_action( 'woocommerce_product_options_general_product_data', 'so24963039_display_custom_general_tab_fields' );
function so24963039_display_custom_general_tab_fields() {
    global $woocommerce, $post;
    $UK_price = get_post_meta( $post->ID, '_UK_price', true );

    woocommerce_wp_text_input(
        array(
        'id' => '_UK_price',
        'label' => __( 'UK Price (£)', 'woocommerce' ),
        'value' => $UK_price,
        'desc_tip' => 'false'
        )
    );
}

//Save custom fields to access via get_post_meta
add_action( 'woocommerce_process_product_meta', 'so24963039_save_custom_general_tab_fields' );
function so24963039_save_custom_general_tab_fields ($post_id) {

    $woocommerce_UK_price = $_POST['_UK_price'];
    if( !empty( $woocommerce_UK_price ) )
    update_post_meta( $post_id, '_UK_price', esc_attr( $woocommerce_UK_price ) );   

}

-----------------For products with Variations----------------------------

WARNING: Variable products are much more complicated and I'm not nearly as confident in this answer as I am with the simple products part above, but here's my current understanding either way. I had some mini-cart display issues that I had to hack around when using this method (which I will explain at the end), but the totals are calculated correctly in both the mini-cart and the regular cart.

First we want to add new fields to each variant on the variation tab of existing products:

add_action( 'woocommerce_product_after_variable_attributes', 'so24963039_variable_fields', 10, 2 ); //Display Fields
function so24963039_variable_fields( $loop, $variation_data ) {

echo '';
woocommerce_wp_text_input(
    array(
        'id' => '_variant_UK_price['.$loop.']',
        'label' => __( 'UK Price (£)', 'woocommerce' ),
        'desc_tip' => 'false',
        'value' => $variation_data['_variant_UK_price'][0]
    )
);
echo '';
}

We also need to add them dynamically whenever the user adds new variants on the edit product page:

add_action( 'woocommerce_product_after_variable_attributes_js', 'so24963039_variable_fields_js' ); //JS to add fields for dynamically added new variations
function so24963039_variable_fields_js(){ //add fields to new variations that get added 
echo '';
woocommerce_wp_text_input(
    array(
        'id' => '_variant_UK_price[ + loop + ]',
        'label' => __( 'UK Price (£)', 'woocommerce' ),
        'desc_tip' => 'false',
        'value' => $variation_data['_variant_UK_price'][0]
    )
);
echo '';
}

Then we save changes to the custom fields in the variation meta data:

add_action( 'woocommerce_process_product_meta_variable', 'so24963039_save_variable_fields', 10, 1 ); //Save variation fields
function so24963039_save_variable_fields( $post_id ) {
if (isset( $_POST['variable_sku'] ) ) {
    $variable_sku = $_POST['variable_sku'];
    $variable_post_id = $_POST['variable_post_id'];

    // Variant Tier 1 Price
    $_variant_UK_price = $_POST['_variant_UK_price'];
    for ( $i = 0; $i < sizeof( $variable_sku ); $i++) {
        $variation_id = (int) $variable_post_id[$i];
        if ( isset( $_variant_UK_price[$i] ) ) {
        update_post_meta( $variation_id, '_variant_UK_price', stripslashes($_variant_UK_price[$i] ) );
        }
    }
}
}

Now that we have our custom variation meta data, we can access it in the custom price module like so:

add_filter('woocommerce_get_price_html','so24863612_custom_price');
function so24863612_custom_price(){
   global $post;
   $_postID = $post->ID;
   $product = get_product( $_postID );
   $product_type = $product->product_type;

   $UK_price = get_post_meta($_postID, '_UK_price', true); //covers simple products 
   if($product_type == 'variation'){ //override with variant prices
            $UK_price = get_post_meta($_postID, '_variant_$UK_price', true);
    }

   $return_price = $product->get_regular_price(); //default to regular price
   if (!empty($UK_price)) { 
      $return_price = $UK_price;
   }
   return $return_price;
}

Now, I believe that part should have everything working except for the mini-cart display. For some reason it seems like I just couldn't figure out how to get access to the variation meta data to force it to display properly in the mini cart - like I found where the mini-cart display was being generated but I was having trouble getting the right context path to access the custom variable so I ended up having to do that in the template-tags.php and pass an array of custom values to an optional parameter in my custom price function. This feels very 'wrong' in terms of how we should do things, but it gets the job done. I'm very open to hearing the 'correct' solution to this part of the problem.

In template-tags.php:

get_title();
                                            echo '' . apply_filters('woocommerce_cart_widget_product_title', $product_title, $_product) . '';
                                            echo '
';
                                            //original line: echo woocommerce_price($_product->get_price());

                                            /*Custom Price Override Block*/
                                            $_productID = $_product->id;
                                            $product_type = $_product->product_type;
                                            if($product_type == 'variation') {
                                                $custom_field_data = $_product->product_custom_fields;
                                                $regular_price = $custom_field_data['_regular_price'];
                                                $custom_UK_price = $custom_field_data['_variant_UK_price'];
                                                $custom_variant_prices = [$regular_price[0], $custom_UK_price[0]];
                                                echo so24863612_get_custom_price($_productID,  $custom_variant_prices ); 
                                            } else {
                                                echo so24863612_get_custom_price($_productID );
                                            }
                                            /*End Custom Price Override Block*/

                                            echo ' /
';
                                            echo '
'.__('Quantity', 'woocommerce').': '.$cart_item['quantity'].'
';

                                        ?>