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<?php
//new_order
//customer_processing_order
//customer_completed_order
//customer_invoice
//customer_note
//low_stock
//no_stock
//backorder
//customer_new_account
//customer_invoice_paid
//For example, to change the email heading of new order emails, use:
1
add_filter('woocommerce_email_heading_new_order', 'my_email_heading_customisation_function', 1, 2);



?>