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Go to view full conversation and then you will be able to see seen of the last message you sent to someone. In chat window mode, it goes away to minimise clutter in chat window.


Ask Ars Facebook: confirmed that as long as you have not deleted the content yourself—or in the case of a message between two people, both people have not deleted it—the content should stay online indefinitely. Not all content is retained and hence recoverable.


Web hook posting can indeed be combined with chat.update functionality. I'll walk you through it below. First use the channels.list API method to determine the encoded channel id which you want to update messages in. Once you have the channel id call the channels.history method to list messages to this channel. From this response you'll be able to identify ...

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