Quote from Alex Dev on September 4, 2026, 14:32

Hello Pavlina

We have looked into your setup and studied both plugins you named, WCFM Marketplace and Packeta, together with FOX.

The short answer: this is not available as a built-in setting, but it is achievable with a small amount of custom code, and the architecture is on your side.

Why it is not a setting. FOX has a fixed shipping price feature, but it attaches to the WooCommerce flat rate and free shipping methods only. Packeta registers its own shipping methods, so those fields never appear for them. More importantly, FOX operates on the currency the customer selected, it has no concept of a vendor, so it can only convert a single base price by rate. That is exactly the behaviour you are seeing.

Why a snippet works well here. WCFM splits the cart into one shipping package per vendor and stores the vendor id inside each package. FOX converts shipping rates on the standard WooCommerce filter woocommerce_package_rates at priority 9999. Code running at a higher priority therefore receives the already converted rate and can replace it with a fixed amount chosen by the vendor country and the selected currency. Packeta itself is not modified and its updates will not affect this.

Add the following to your child theme functions.php, or better, to a small must-use plugin. Edit the price table at the top, everything else can stay as it is.

function my_vendor_shipping_table() {
	return array(
		'SK' => array(
			'default' => array(
				'EUR' => 3.90,
				'CZK' => 99.00,
			),
		),
		'CZ' => array(
			'default' => array(
				'EUR' => 3.50,
				'CZK' => 89.00,
			),
		// Example of one carrier priced differently from the rest.
		// 'packeta_method_zpointcz' => array( 'EUR' => 2.90, 'CZK' => 79.00 ),
		),
	);
}


function my_get_package_vendor_country($package) {

	$vendor_id = 0;

	// WCFM puts the vendor id into the package when store shipping is on.
	if (isset($package['vendor_id']) && $package['vendor_id']) {
		$vendor_id = (int) $package['vendor_id'];
	}

	// Fallback: take the vendor of the first product in the package.
	if (!$vendor_id && !empty($package['contents']) && function_exists('wcfm_get_vendor_id_by_post')) {
		foreach ($package['contents'] as $item) {
			if (!empty($item['product_id'])) {
				$vendor_id = (int) wcfm_get_vendor_id_by_post($item['product_id']);
				break;
			}
		}
	}

	if (!$vendor_id || !function_exists('wcfmmp_get_store')) {
		return '';
	}

	$store = wcfmmp_get_store($vendor_id);

	if (!$store || !method_exists($store, 'get_address')) {
		return '';
	}

	$address = $store->get_address();

	return isset($address['country']) ? strtoupper(trim($address['country'])) : '';
}


add_filter(
	'woocommerce_package_rates',
	function ($rates, $package) {

		global $WOOCS;

		if (!is_object($WOOCS) || empty($rates)) {
			return $rates;
		}

		$vendor_country = my_get_package_vendor_country($package);

		if ('' === $vendor_country) {
			return $rates;
		}

		$table = my_vendor_shipping_table();

		if (!isset($table[$vendor_country])) {
			return $rates;
		}

		$currency = strtoupper($WOOCS->current_currency);
		$rules = $table[$vendor_country];

		foreach ($rates as $rate) {

			$method_id = $rate->get_method_id();

			// Only touch Packeta methods, leave everything else alone.
			if (strpos($method_id, 'packeta') !== 0 && strpos($method_id, 'packetery') !== 0) {
				continue;
			}

			// Per method price first, the shared price second.
			if (isset($rules[$method_id][$currency])) {
				$new_cost = $rules[$method_id][$currency];
			} elseif (isset($rules['default'][$currency])) {
				$new_cost = $rules['default'][$currency];
			} else {
				continue;
			}

			$new_cost = (float) $new_cost;

			$rate->set_cost($new_cost);

			// The tax was calculated from the old cost, recalculate it.
			if (function_exists('wc_tax_enabled') && wc_tax_enabled() && !WC()->customer->is_vat_exempt()) {
				$rate->set_taxes(WC_Tax::calc_shipping_tax($new_cost, WC_Tax::get_shipping_tax_rates()));
			} else {
				$rate->set_taxes(array());
			}
		}

		return $rates;
	},
	99999,
	2
);


add_filter(
	'woocommerce_cart_shipping_packages',
	function ($packages) {

		global $WOOCS;

		if (!is_object($WOOCS)) {
			return $packages;
		}

		foreach ($packages as $key => $package) {
			$packages[$key]['woocs_currency'] = $WOOCS->current_currency;
		}

		return $packages;
	},
	100
);

A cart containing products from a Slovak and a Czech seller at the same time produces two packages, so each one is priced from its own country independently. That is the behaviour you described.

Points worth checking on your side before you go live:

The country must actually be filled in each vendor's store address, otherwise the package is skipped and the normal converted price is used. This is a safe fallback rather than an error, but it will look like the code is not working.

If your prices are entered including tax, put tax inclusive amounts into the table and remove the tax recalculation block, otherwise tax will be added twice.

If you use the block based cart and checkout rather than the classic shortcodes, please test there specifically. The filter is the same, but the recalculation path differs and it is worth confirming on your setup.

Packeta free shipping thresholds and cash on delivery surcharges are calculated from the cart total and are not touched by this code.

The second filter is useful on its own, with or without the vendor logic. Without it WooCommerce can serve a cached shipping rate from the previously selected currency.

Best regards
Alex