Wordpress Woocommerce plugin mail triggering

Question

Mail not sending when status changed from processing to on-hold and processing to failed. Kindly tell me how to achieve this. Thanks in advance

Answer 1

Even that kind of questions (directly asking the need without any research or any part of code) are not welcomed here, I want to help you about that by giving the basic idea.

In the file "wp-content/plugins/woocommerce/includes/class-wc-emails.php", search for the "public static function init_transactional_emails()" and check "$email_actions" array there.

$email_actions = apply_filters(
            'woocommerce_email_actions', array(
                'woocommerce_low_stock',
                'woocommerce_no_stock',
                'woocommerce_product_on_backorder',
                'woocommerce_order_status_pending_to_processing',
                'woocommerce_order_status_pending_to_completed',
                'woocommerce_order_status_processing_to_cancelled',
                'woocommerce_order_status_pending_to_failed',
                'woocommerce_order_status_pending_to_on-hold',
                'woocommerce_order_status_failed_to_processing',
                'woocommerce_order_status_failed_to_completed',
                'woocommerce_order_status_failed_to_on-hold',
                'woocommerce_order_status_on-hold_to_processing',
                'woocommerce_order_status_on-hold_to_cancelled',
                'woocommerce_order_status_on-hold_to_failed',
                'woocommerce_order_status_completed',
                'woocommerce_order_fully_refunded',
                'woocommerce_order_partially_refunded',
                'woocommerce_new_customer_note',
                'woocommerce_created_customer',
            )
        );

Since after every update of Woocommerce plugin any changes you made on those files will be gone, you need to add your email trigger for status changes you mentioned by either using a hook or overriding the files using your child theme.

About your request, for "from processing to on-hold" you need to add:

'woocommerce_order_status_processing_to_on-hold',

About overriding a file (or function) from includes folder of Woocommerce you may check this post: Override woocommerce files from includes folder

I hope this will help you to solve it. Have a good day.