'See what link was used when new user joins to telegram channel

I am trying to make a telegram bot for accounting invite links. It is supposed to count how many times a certain link was used. I tried to get an invite link from Update when a new user recently joined a chat, but ChatMemberUpdate always has invite_link empty. It seems that it should work but it doesn't and I don't know why.

c++sharptelegramtelegram-botchatbot


Solution 1:[1]

I also encountered this problem, after my test?But in the private group you can get the Update chat_member invite_link, the public group is null

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Solution 1 ???

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