You can customise the email templates to include additional information and then send them to your customers. Both the subject line and body of the message can be customised by inserting placeholders. To insert placeholders:
The selected fields will be available in the emails you send to your customers.
Note: If a custom field does not have any value, you will not be able to include it in the email. To send the email to your customers, remove the custom fields that do not have any value.
and GST filing.