woocommerce_product_options_downloads │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_product_options_downloads', 'wp_kama_woocommerce_product_options_downloads_action' );

/**
 * Function for `woocommerce_product_options_downloads` action-hook.
 * 
 * @return void
 */
function wp_kama_woocommerce_product_options_downloads_action(){

	// action...
}

Where the hook is called

do_action( 'woocommerce_product_options_downloads' );

Where the hook is used in WooCommerce