Docs
Scope
How Proration is calculated when a sub is upgraded/downgraded?
Formula to calculate proration.
Calculate Proration when calendar billing is ON
Is there a default setting for proration?
Summary
Proration is calculated in two types: day-based and milli-second based. To enable proration, head to Settings > Configure Chargebee > Billing LogIQ and check the “Enable Proration” checkbox.
Then you can manage the proration settings from Billing Mode.
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