We bought 2 RT tickets from Nice to Narbonne. We chose our specific seats. I gave my credit card info (having called them ahead to tell them to approve it). It said we were finished and would get email confirmation. We printed that web page just to take with us - we know is not a receipt nor is it a ticket which is why we are concerned.
We did all this on Sunday. It is now Tuesday afternoon. No email. No deduction from credit card , although one may be pending. They sometimes don't show up until actually paid.