Hello, welcome to therichpost.com. In this post, I will tell you, Add custom message to the woocommerce Order Completed Email. WordPress is the best cms and Woocommerce is the best Ecommerce plugin. WordPress hooks(add_action, add_filter) give us the power to edit or change the code without interruption into the files and this is the best thing about wordpress. Now I am going to tell you how the hooks work.

Here is the working code and you need to add this into your theme’s functions.php file:

function action_woocommerce_email_before_order_table( $order, $int, $int ) { 
    if($order->get_status() == 'completed') {
       _e("Your custom text goes here"); 
    }
}; 
add_action( 'woocommerce_email_before_order_table', 'action_woocommerce_email_before_order_table', 10, 3 );

 There are so many hooks in wordpress and i will let you know all. Please do comment if you any query related to   this  post. Thank you. Therichpost.com