I'm developing a bot in telegram , here is my problem: I have some posts in my channel which some inline_keyboards are attached to them. when a user press the button , next events happen in a bot and some messages show to a user. if user has been started the bot before , there is no problem , if not I have error. how should I check the user is member of my bot or not to handle this problem???
There is no way to check if bot can talk to user or not without send message.
You can use url with https://t.me/Bot?start=some_data format, and you will receive /start some_data, please try this link yourself.
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