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rules200
Dear friend, There is no need to pay any fees to attend the meeting by the user.
Users only need to pay, When users purchasing a course.
And if the course is created by the instructor(Teacher). then some percentage of cost of the course will be added in the instructor account.
But in the meeting which is created by the bigblue button, there is no way to pay the fees by the user to attend the meeting.
If you want to know more about the bigbluebutton please contact to the support of bigbluebutton.