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This article explains what happens when you change a subscription (price, plan, addon, coupon) that has an advance invoice for the current period, and why customers may appear to be billed twice.
When you change a subscription that has an advance invoice (e.g., override price, change plan/addon, or change coupon), the advance charges are refunded as credits and a credit note is created for that invoice.
Flow
Note:
Credits available under the customer are automatically applied to upcoming invoices.
Watch this video for a walkthrough.
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