Quote from Alex Dovlatov on January 20, 2026, 14:50

Hello Varadi

I can suggest you this way: https://currency-switcher.com/woocs-labs/ - create please stage site, clone of described site,  using https://wordpress.org/plugins/duplicator/, provide wp-admin and ftp access to that stage site in the secret area of this ticket, and write us here that you did it. The task will be reviewed within 2 or 3 weeks without warranty of success

https://share.pluginus.net/image/i20230222134241.png
https://share.pluginus.net/image/i20230222134615.png
https://share.pluginus.net/image/i20230222134511.png

Also will be good, to avoid additional questions, short video where will be demonstrated issues on the stage site

Welcome!

Quote from varadi.balazs on January 29, 2026, 02:07

Hi Alex!

I added the info

Quote from Alex Dovlatov on January 29, 2026, 20:24

Hello Varadi

Thank you! Ftp works fine, but wp-admin redirect me to 'not_found' page, pleace re-check it and give me know here please ...

 

Quote from varadi.balazs on January 30, 2026, 20:02

Hi Alex!

 

Sorry - fixed.

Quote from Alex Dovlatov on February 2, 2026, 13:28

Hello Varadi

Thank you, task registered!

Quote from Alex Dovlatov on February 9, 2026, 21:39

Hello Varadi

We investigated the code of the plugin file: plugins/product-extras-for-woocommerce/inc/functions-cart.php and played with it code. Looks like adaptation with WOOCS is inside there already. So after experiments with it, when products normally add on  single page when basic currency is enabled, but with bad recalculation if any another currency switched, special code was created and placed into file functions.php of the current wp theme:

/**
 * Force base currency during cart item data processing
 */
add_filter('woocommerce_add_cart_item_data', 'woocs_pewc_force_base_before', 1, 4);
add_filter('woocommerce_add_cart_item_data', 'woocs_pewc_restore_after', 999, 4);

function woocs_pewc_force_base_before($cart_item_data, $product_id, $variation_id, $quantity) {
    if (!class_exists('WOOCS')) {
        return $cart_item_data;
    }
    
    global $WOOCS;
    
    if ($WOOCS->current_currency != $WOOCS->default_currency) {
        $GLOBALS['woocs_pewc_saved_currency'] = $WOOCS->current_currency;
        $WOOCS->set_currency($WOOCS->default_currency);
    }
    
    return $cart_item_data;
}

function woocs_pewc_restore_after($cart_item_data, $product_id, $variation_id, $quantity) {
    if (!class_exists('WOOCS')) {
        return $cart_item_data;
    }
    
    global $WOOCS;
    
    //back currency
    if (!empty($GLOBALS['woocs_pewc_saved_currency'])) {
        $WOOCS->set_currency($GLOBALS['woocs_pewc_saved_currency']);
        unset($GLOBALS['woocs_pewc_saved_currency']);
    }
    
    return $cart_item_data;
}

Now products adding to the cart works fine! I checked it with product https://staging.vlbbtab.com/product/split-finger-tab-calfskin-l-size/

• 
• 

Check it. Also its important and you did it to place next code into file functions.php:

function pewc_get_multicurrency_price($price, $item, $product) {

// Compatibility with WooCommerce multilingual
    $price = apply_filters('wcml_raw_price_amount', $price);

    if (class_exists('WOOCS')) {
        global $WOOCS;
        if ($WOOCS->is_multiple_allowed) {
            $price = $WOOCS->woocs_exchange_value(floatval($price));
        }
    }

    return $price;
}

add_filter('pewc_filter_field_price', 'pewc_get_multicurrency_price', 10, 3);
add_filter('pewc_filter_option_price', 'pewc_get_multicurrency_price', 10, 3);

 

Test it please and write me feedback how its works now ...

p.s. in FOX options I changed "Currency storage" -> "FOX Session"

 

Quote from varadi.balazs on February 10, 2026, 12:22

Hello Alex!

Just to clarify: I did not apply/modify anything on my side.

I tested on the same staging environment you’ve been working on (the one you also edited), and the issue is still reproducible there — so this is not caused by missing implementation on my end.

Current status on your staging:

• If all add-on options are 0-priced, then the currency totals look correct.

  • Example (USD): product page shows ~22.5, cart also shows ~22.5 ✅

• As soon as an option becomes paid, the product page and cart totals diverge.

Repro steps (simple + consistent):

1. Open the product you tested (Split-finger Tab Calfskin – L size).

2. Switch currency to USD.

3. Change Thread color to a paid option (eg. purple).

4. Before adding to cart, the product page shows the correct expected total:

   • Expected: 25.16 USD

   • Displayed on product page: 25.16 USD ✅

5. Add to cart → the cart total is different:

   • Cart shows: 24.75 USD ❌

GBP shows the same type of problem (EUR remains OK).

So right now it looks like the front-end display can be correct, but the cart calculation still uses a different base/conversion path when a non-zero add-on price is involved.

 

Quote from Alex Dovlatov on February 10, 2026, 16:38

Hello Varadi

Ok, I will re-open the task, and will bakc here later as it will be done

Thank you for your cooperation ...

 

Quote from Alex Dovlatov on February 20, 2026, 18:33

Hello Varadi

So, looks like works, here is the link: https://staging.vlbbtab.com/product/split-finger-tab-calfskin-l-size-longer-face/

To make experiment clear was deactivated all plugins exept nessesary and wp theme was set to basic "storefront"

from file /wp-content/plugins/product-extras-for-woocommerce/inc/functions-cart.php was removed all the code related to WOOCS plugin and added code only into function pewc_add_cart_item_data:

if (class_exists('WOOCS')) {
    global $WOOCS;
    if ($WOOCS->is_multiple_allowed && $WOOCS->current_currency != $WOOCS->default_currency) {
        $currencies = $WOOCS->get_currencies();
        $rate = $currencies[$WOOCS->current_currency]['rate'];
        $product_price = $product_price / $rate; // back to EUR base
    }
}

Into file functions.php was added next code:

// Convert option prices to current currency ONLY for product page display
// Does NOT run during AJAX cart add requests
function pewc_woocs_convert_option_price($price, $item, $product) {
    if (!class_exists('WOOCS')) return $price;
    
    // Only convert for direct page rendering, not during AJAX (cart add)
    if (wp_doing_ajax()) return $price;
    
    // Only convert on single product pages
    if (!is_product()) return $price;
    
    global $WOOCS;
    if (!$WOOCS->is_multiple_allowed) return $price;
    if ($WOOCS->current_currency == $WOOCS->default_currency) return $price;
    
    $currencies = $WOOCS->get_currencies();
    $rate = $currencies[$WOOCS->current_currency]['rate'];
    return $price * $rate;
}
add_filter('pewc_filter_option_price', 'pewc_woocs_convert_option_price', 10, 3);
add_filter('pewc_filter_field_price', 'pewc_woocs_convert_option_price', 10, 3);

 

Now adding of products into the cart is stable: https://drive.google.com/file/d/1YTj2dFZbeBqBy0fTA6bpSeQRNyYclRBE/view?usp=sharing

 

Test it please on production ...