Hello,
i am a Moodle developer and this is easy to do =)
I was planning to do this on a not so far future.
Also, i will implement a patch to the current enrol plugin that let you configure one email per instance instead of a global one.
If you want more, we can also take a look at how Paypal handle multiple payments and add this to both plugins.
What do you say?
Kind regards,
Daniel
(Edited by Howard Miller, removing part about funding at poster's request - original submission Monday, 6 April 2015, 2:42 PM)