Created
July 23, 2014 14:49
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Stripe - Calculate Subscription Proration
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| proration cost = (period end - API request time) / (period end - period start) * quantity * plan price |
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I would use this for a yearly subscription: quantity * plan_price * 12 * (period end - Api request time) / (period end - period start)
You compute a ratio of the time left / total time, then multiply that by the annual cost.