WordPress at a glance
filter is not described

woocommerce_rate_code filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_rate_code', 'filter_function_name_112', 10, 2 );
function filter_function_name_112( $code_string, $key ){
	// filter...

	return $code_string;
}
$code_string
-
$key
-

Where the hook is called

WC_Tax::get_rate_code()
woocommerce_rate_code
woocommerce/includes/class-wc-tax.php 745
return apply_filters( 'woocommerce_rate_code', $code_string, $key );

Where in WP core the hook is used WooCommerce

Usage not found.