"Impossible" stuffs i want to do. Need your help

[Goodman_2020]

Hello,

Ineed one more time your precious help

it's very special what i want to do and i di'nt find any hack to do it, or any idea to do something looking like what i want.

What i want:
You chose a person from a special usergroup, if the person is online, you have a button to chat with her, so you click on a button to chat with this person and only this person and nobody else that these 2 persons can join the conversation (sort of private chat). But before you can chat with the person, you have 1) to agree some rules (each time you want to open a new chat, if you don't agree, you can't acess the chat) and 2) to pay via paypalthe acess to the chat

Once the person from the special usergroup, close the chat window, the "subscription" of the member ends.

Thanks