Chat solution for dating service?

Okay, so not actually a dating service, but similar

We match psychologists with clients.

  1. A user creates a post

  2. All posts are shown to a bunch of psychologists

  3. Psychologists send a response to posts which registers their interest

  4. The client selects the psychologist they would like to chat with. - When the user selects the psychologist, this generates a URL which is made up of the psychologists ID and the clients ID
    On this user generated URL I would like to provide a chat which hosts only the two relevant people, request payments and send images and forms.

Whats the best way to go about this? whats available out there?

You can develop such a website with code. If interested please DM me with the chat app in this forum. I will get back to you as soon as possible.