Steps to see a list of all the automated emails going out after a paid registration is completed.
dashboard
events
click "edit" on the event
on the tabs within the event choose "email"
there is a list of auto emails that are generated based on the message type
click "edit" next to the email that you want to customize
If you want to add a custom email choose "Use a custom message for this event" in the drop down
add email content
click save
** if you do not customize the email it will be generic