In MF Version 2, I was able to create the payment link in the confirmation email. But no longer possible. I would like to at least have it included in the "email entry" now for those users that miss paying! So awkward now to have unpaid registrations, but no way to let them pay.
Also, in the past I could add code to the post-functions.php which would let me check if they'd already registered, to avoid the duplicates. No way I can see to do that now. :-(