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Discussion on: Stripe - Upgrading a subscription synchronously (immediately charge for a proration without webhooks)

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Marc Köhlbrugge

I haven't thoroughly tested, but this seems to work more reliably:

👆 This returns the 'unused amount'. So if a customer is halfway through a $25/mo period, this would be about $12.50

It looks through all the line items, selects just the negative amounts, and adds them all up. Usually this is just one line item, but in theory it could be multiple.

👆 This is pretty simple. It's the total amount (including any taxes) the customer were to pay. So continuing the $25/mo example, with let's say a $200/year annual plan, this would be about $200 - $12.50 (see above) = $187.50