Etienne 90acecfbd9 feat(billing): invoice on seat increase (#22083)
## Context

Two billing improvements around workspace seat changes:

1. **Delay subscription quantity updates.** Every workspace member
create/delete/destroy event used to enqueue an
`UpdateSubscriptionQuantityJob` immediately.

2. **Invoice immediately when seats increase.** Seat increases
previously used `create_prorations`, which defers the charge to the next
billing cycle. We now bill the proration right away on increases, while
keeping deferred prorations on decreases / no-ops.

## Changes

### Job delaying
- `BillingWorkspaceMemberListener` now enqueues the job with the
per-workspace id and a 24h delay. Re-adds within the window coalesce to
a single delayed run per workspace, collapsing bursts of member changes
into one Stripe update.

### Proration behavior
- `computeSubscriptionUpdateOptions` now accepts an optional `{
currentSeats }` context. For `SEATS` updates it returns `always_invoice`
when `newSeats > currentSeats`, otherwise `create_prorations` (decrease
or unchanged).
- `BillingSubscriptionUpdateService` passes `currentSeats:
licensedItem.quantity` so the decision is based on the actual current
subscription quantity.

## Tests
- `compute-subscription-update-options.util.spec.ts`: added cases for
seat increase (`always_invoice`), decrease (`create_prorations`), and
unchanged (`create_prorations`).
- `billing-subscription-update.service.spec.ts`: updated expectations to
`always_invoice` for the seat-increase paths.


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2026-06-24 14:31:15 +00:00
2026-06-11 11:02:28 +02:00

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