#lennard.
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If the usage is different every month, it's better to use usage-based billing: https://stripe.com/docs/billing/subscriptions/usage-based
You will the record every API card with Usage Record: https://stripe.com/docs/products-prices/pricing-models#reporting-usage
This is suitable if the customer buys a fixed amount of calls for each month, e.g. 120, and then only get this much, every month.