How do you calculate the fee when someone leaves or joins in the middle of a month?

The rate adjusts every time a slack user is removed or added. There is a pro-rata mechanism. So for example, if you spend 1/3 of the month at 180 users and 2/3 of the month at 120, the rate will be: (1/3 * 180 + 2/3*120) * ($_Current_price)

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Birthday messages
Celebrate birthdays of your coworkers.
Work anniversary messages
Celebrate work anniversaries of your coworkers
List of upcoming events
See next events and search for anyone's birthday.
Opt-out option
Anyone can opt-out from birthdays or work anniversaries if they don't want to be celebrated.
Week-end management
When birthdays happen on week-ends, you can choose to delay the message on the next Monday or to celebrate on Friday.
Auto-collection of dates
Billy can reach out to your colleagues to collect their birth dates.
Spreadsheet bulk import
You can import people's dates inside a spreadsheet that we provide.
Private channels
Billy can be added to any public or private channels.
Add Billy to any channel you'd like to use for birthday celebrations.