Example : Let's say some user wants to join our private channel called hackers channel. but we want him to be a member of our other channel/group called "channel 2" before joining our Hackers channel.
The bot we are making will verify if he is member of channel 2 and if he is a member it will create a joining link and give it to the user to join our Hackers channel.
Other use cases:
1. You can create a bot that provides joining link only after user accepts the terms & conditions of you channel
2. Provide joining link only when users solves some questions and prove that he has a enough knowledge to join your channel
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