Understand accepted billing agreements
Keep subscription price, interval and AI surcharge tied to the terms each customer accepted.
Publishing a plan does not silently rewrite existing customer agreements. A grant records the accepted contract version, selected plan and scopes. A subscription can combine a periodic price and a percentage added to inference cost.
| Example plan | Periodic payment | For €100 of inference |
|---|---|---|
| Usage only | €0 | €100 + agreed AI surcharge |
| Pro: €20/month + 10% AI surcharge | €20 per confirmed monthly period | €110, charged separately from the subscription |
A lower AI surcharge may be applied under the manual or settled-usage transition rules the customer accepted, only when plan kind, periodic price and interval are unchanged. An increased surcharge, changed price or changed interval needs new consent.
A positive-price subscription must have a confirmed, unexpired payment period before surcharged inference runs. Choosing a subscription during OAuth consent is not a payment. Create a checkout request.
Each renewal requires another customer-confirmed checkout. There is no automatic background debit. A second payment for an already-active subscription period is rejected; upgrades and prorated charges are not automatic.
The Builder membership fee, 1.5% by default, is deducted only from the Builder’s AI surcharge earnings. It is not deducted from product prices or periodic subscription charges.
Last updated September 18, 2026