woocommerce_email │ action-hook │ WC 1.0

Usage

add_action( 'woocommerce_email', 'wp_kama_woocommerce_email_action' );

/**
 * Function for `woocommerce_email` action-hook.
 * 
 * @param  $that 
 *
 * @return void
 */
function wp_kama_woocommerce_email_action( $that ){

	// action...
}

$that

-

Where the hook is called

do_action( 'woocommerce_email', $this );

Where the hook is used in WooCommerce