https://intercom.help/sandbox-software/en/articles/2039051-setting-up-attendance-based-billing
Setting up Attendance Based Billing | Sandbox Software Help Center
billed based on attendance
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https://intercom.help/sandbox-software/en/articles/1914320-how-do-i-add-a-billing-note
How do I add a billing note? | Sandbox Software Help Center
adding a billing note
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