I designed a chat popup with an admin panel and the chat popup is already uploaded on different websites in which the visitors send a message to the supporters. Still, I want to know from which website I receive a message.
You can send window.location.href value from the popup to the supporter. This value should be sent as a system message which is not a regular chat message but a hidden message dedicated to sending technical informations. You can send the message at the beginning of the connection.