woocommerce_coupon_code_generator_prefix filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_coupon_code_generator_prefix', 'filter_function_name_3905' );
function filter_function_name_3905( $string ){
	// filter...

	return $string;
}

$string

-

Where the hook is called

'prefix'               => apply_filters( 'woocommerce_coupon_code_generator_prefix', '' ),

Where in WP core the hook is used WooCommerce