Code-Snippets-Functions/Execute a function on a child site/WooCommerce/prevent-customers-by-zipcode-from-checking-out.txt

function wc_validate_zipcodes( $fields, $errors ) {
	// Enter your zip codes in this array
	$excluded_zips = array( '93301', '93304', '93305' );
	if( in_array( $fields['shipping_postcode'], $excluded_zips ) ) {
		$errors->add( 'validation', 'That zipcode is not allowed' );
	}
}
add_action( 'woocommerce_after_checkout_validation', 'wc_validate_zipcodes', 10, 2 );