Félix Malfait
0755855768
## Problem
Upgrading resource credits fails with `Invoice is already paid` whenever
the one-off upgrade invoice resolves to a $0 amount due. That is the
case for internal workspaces on the `Twenty Internal - 100% FREE`
coupon, and for customers whose credit balance covers the price
difference.
Reproduced on an internal workspace (5 to 20 credits upgrade):
1. `createImmediateUpgradeInvoice` creates the invoice for the $20 diff
and finalizes it with `auto_advance: true`
2. The 100% coupon brings the amount due to $0, and Stripe settles
zero-due invoices at finalization ("Invoice was finalised and
automatically marked as paid because the amount due was US$0.00")
3. The explicit `stripe.invoices.pay()` that follows is rejected with a
400 `invalid_request_error`: "Invoice is already paid"
4. The error propagates, so the mutation aborts before
`runSubscriptionUpdate`: the Stripe subscription item stays on the old 5
credits price while the upgrade invoice already exists
5. Every retry creates a new invoice item + invoice and fails the same
way, leaving stray $0 invoices on the customer
## History
Third pass on this code path:
- #21097 treated it as a race with `auto_advance` and switched
finalization to `auto_advance: false`. Zero-due invoices are settled at
finalization regardless of that flag, so the failure remained.
- #21450 restored `auto_advance: true` and swallowed the error when
`error.code === 'invoice_already_paid'`. Stripe does not send that code
for this failure (it is not in its documented error codes; the response
only carries the message), so the guard never matched and the error was
always rethrown.
## Fix
Rely on invoice status instead of error codes:
- `finalizeInvoice` returns the finalized invoice; when it comes back
`paid` (the zero-due case), skip `pay` entirely
- if `pay` still fails (the genuine auto_advance race from #21097),
re-retrieve the invoice and only rethrow when it is actually unpaid
## Tests
Unit tests for `createImmediateUpgradeInvoice`:
- open invoice after finalization gets paid
- invoice settled at finalization skips `pay`
- `pay` failure with a meanwhile-paid invoice is swallowed
- `pay` failure with an unpaid invoice is rethrown
---
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