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add_action('woocommerce_package_rates', 'unset_vast_tarief_if_free_shipping', 10, 2);
function unset_vast_tarief_if_free_shipping($rates, $package)
{
if (isset($rates['free_shipping:2']) && isset($rates['flat_rate:1'])) {
unset($rates['flat_rate:1']);
}
return $rates;
}