Origin of message

Hy, I would like to know whether the website or the facebook page is the origin of the conversation.

I found this solution:

“message”: {
“mid”:”mid.14577641449818:41d102a3e1ae206a38″,
“text”:”hello, from customer chat!”,
“tags”: [
{
“source”: “customer_chat_plugin”
}
]
}

Under this site: https://developers.facebook.com/docs/messenger-platform/discovery/customer-chat-plugin#detect

My question is how to implement this code under the Messenger Customer Chat plugin code editor?