I have a client who wants users at checkout to enter an e-mail for their confirmation of sale (in the billing info) that can be different from the e-mail listed in the user's profile, (for reasons I won't go into).
So I need to know how to:
a) add e-mail address field to the billing info
b) send e-mail confirmations go to that e-mail in addition to, or instead of, the user profile e-mail.
I am not a php coder, although I can edit it some.
All I really want to know is - is this request so complicated that I need to hire a coder or is there a way to easily add additional e-mail confirmation addresses?
Thanks for any advice! (Other than telling the client to use the product correctly, I've done that already) 
Kim