@ antonella
For payments, I always suggest using a membership plugin like Restrict Content Pro. They specialize in managing membership payments/levels/renewals and such. I do not plan on adding such functionality to Connections because it is far better for you to be a to better monetize your site with the many options available using a membership plugin vs. being locked into just using a directory listing as a membership perk.
So you could use Form and Link but only access given when with a valid membership. There is no specific integration with Connections and a membership plugin. You would just “lock” the pages to members only.
Now, they is no way in Connections to give the user the ability to have more than one entry. It is one user to one entry.
Hope that answers your question thoroughly!