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Available from API version 2026-05-27.curie onwards.
Triggered when Nomos has exhausted dunning attempts and marks the invoice as uncollectible. Limited to usage and prepayment invoices.

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Response body parameters

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id
string
required
Unique event identifier (starts with evt_).
​
timestamp
string
required
ISO 8601 timestamp when the event was created.
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topic
literal
required
Always invoice.uncollectible for this event.
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context
object
required
Event-specific data containing related resource IDs.
{
  "id": "evt_abc123def456ghi789jkl012",
  "timestamp": "2026-01-15T10:30:00.000Z",
  "topic": "invoice.uncollectible",
  "context": {
    "invoice": "inv_abc123def456ghi789jkl012"
  }
}