i think verotel is simply talking about an email utility and opt-in page. 2000charge and globill also have that.
But whatever it is, it's good to see that webmasters at least have options and don't completely have to kiss their rebills goodbye.
Besides, if your users *really* lke your site, there is no reason why they would not opt-in to be rebilled with a new processor. On ther other hand, if your users don't really like your site and you make it hard for them to cancel rebilling (naughty boy!) then you should be very worried about losing rebills.
In other words, honest webmasters with good sites don't really have a lot to worry about. Their users should stick with them in a move to a new biller.
Now how many of us are honest webmasters with good sites?
