Mark an invoice uncollectible
Writes off an open invoice as bad debt. Unlike a void, it keeps its amountDue and the customer can still pay it later through hostedUrl; that payment marks it paid and doesn’t change the subscription. Its effect on the subscription now is the same as voiding: a past_due subscription becomes active again once no other overdue invoice is left, and a suspended one becomes an ordinary pause (pauseReason: requested) for you to resume or cancel.
Authorizations
Use a Bouclay secret key (sk_test_..., sk_live_...) or restricted key
(rk_test_..., rk_live_...).
A secret key can call every endpoint. A restricted key can only call the
endpoints its scopes cover. A scope is {resource}:{access}, for example
customers:read or refunds:write, and write includes read. GET
requests need read access and everything else needs write, except
POST /subscriptions/{id}/items/{item}/preview, which only needs
subscriptions:read. A request outside the key's scopes gets 403 permission_denied naming the missing scope, and its Idempotency-Key
is not used up.
Publishable keys (pk_...) are rejected by server-side API endpoints. A
key's mode scopes what it can see and charge: a test key can never reach
a live card.
Headers
Required for POST and PATCH requests. Replays identical method + path + body requests and rejects mismatched re-use.
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