Add button to forward message from channel in Telegram

Question

I'm not quite sure it's possible but probably someone did that. Is it possible to use bot for appending button to message user forwarded to bot? I mean:

1. Admin posted a message in his channel.
2. Admin forwarded message to bot (assume bot added in channel).
3. Bot appends to original message in channel with button.

Answer 1

So the answer is yes - it can be done with editMessageReplyMarkup API method:

curl 
  --request POST \
  --url https://api.telegram.org/bot{BOT_SECRET_TOKEN}/editMessageReplyMarkup \
  --header 'Content-Type: application/json' \
  --data '{
    "chat_id": {CHANNEL_ID},
    "message_id": {CHANNEL_MESSAGE_ID},
    "reply_markup": {
        "inline_keyboard": [
            [
                {
                    "text": "Hello world!",
                    "url": "https://google.com"
                }
            ]
        ]
    }
}'