Payment Email

How do I create a custom email for when people purchase from our site? I was thinking I would put it somewhere in the languages, but I'm not quite sure where. Thanks!

The texts in the email can be changed in the config under the tab languages by overriding the default translation strings.
However, if you want to personalize the structure of the email, then you will need to edit the email via the menu System->Emails (that feature is only available in the Business edition).