Use all wc_mail arguments
We would like to attach files to the coupon emails. In class-wc-compatibility-2-3.php at line 38 you are using your own wc_mail function, but are not using all arguments. If you could add the attachment argument with the woocommerce_email_attachments filter we could easily attach files without changing your plugin with every update.
Last updated: December 7, 2016