Code-Snippets-Functions/Execute a function on a child site/WooCommerce/disable-zipcode-shipping-calculator-validation-checkout.txt

add_filter( 'woocommerce_shipping_calculator_enable_postcode', '__return_false' );

add_filter( 'woocommerce_default_address_fields' , 'wc_disable_postcode_validation' );
 
function wc_disable_postcode_validation( $address_fields ) {
  $address_fields['postcode']['required'] = false;
  return $address_fields;
}