Balances

Balances

Balances, caps and overage

• A balance counts down to 0. Going below 0 is overage.
• Two things let usage go past 0, and nothing else does:
  • a usage-based price on the plan item — they go over and get billed for it.
  • the overage_allowed billing control.
• If neither is set, included IS the cap: usage stops at 0 and check returns allowed: false. Nothing extra is needed to enforce it.
• So never add a spend_limit to "cap" a feature that has no overage price and no overage_allowed — it is already capped, and the limit does nothing.

How controls interact with balances

• Only overage_allowed changes whether usage may pass 0. The rest just bound usage that is already permitted.
• usage_limits: a separate gate on TOTAL usage per time window, counted independently of the balance. This one bites whether or not overage exists, and can sit below the included amount.

Tracking past zero

• On track, overage_behavior decides what happens to a deduction that does not fit.
• cap (default): deducts only what fits and stops at 0.
• overflow: deducts the whole value and lets the balance go negative. usage_limits do not clamp it; spend_limits still apply.

Billing Controls

• Billing controls are runtime policy on a customer or entity.
• They do not define what a plan grants; they change how usage is allowed, capped, alerted, or topped up.
• They are often exposed as customer-facing settings, except overage_allowed which is usually product/admin controlled.

• overage_allowed: whether usage can continue after granted balance is exhausted.
• spend_limits: cap overage in feature units, not dollars.
• usage_limits: hard usage caps over a time window.
  • Useful when a plan grants multiple balances, e.g. 5/day and 5/month, but the customer also needs a separate 100/month cap.
  • Useful for credit systems when credits are shared, but one mapped action needs its own cap, e.g. 10 action_1 calls/day.
• usage_alerts: notify when usage crosses a threshold; alerts do not block usage.
• auto_topups: automatically buy prepaid quantity when balance drops below a threshold.

• Customer-level controls apply to the customer.
• Entity-level controls can override customer-level controls for that entity.
• Auto top-ups are customer-level only.

• Inspect current customer/entity state before changing billing controls.
• For auto top-ups, verify the feature has a one-off prepaid purchase path.
• Do not describe alerts as blocking usage or spend limits as dollar limits unless the feature units are dollars.

• Billing controls: https://docs.useautumn.com/documentation/customers/billing-controls
• Auto top-ups: https://docs.useautumn.com/documentation/modelling-pricing/auto-top-ups
• Spend limits and usage alerts: https://docs.useautumn.com/documentation/modelling-pricing/spend-limits