How to add a custom chatbox for clients

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Hey all, I am currently configuring my website via WordPress, but am struggling with live chat with customers.
I have a general live support chat using Crisp, but I would need one to talk to the clients after their purchase. Its important that only the customer can talk to the assigned person from the business, but no one else can see the chat other than admins. Any recommondations or ideas?

Thank you 🙂