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Triggered once the signup process completes: the previous supplier has been cancelled and the grid operator has confirmed the supply start date. Can trigger more than once per subscription if the start date later changes, so make handlers idempotent on subscription ID and current start date.

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Response body parameters

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id
string
required
Unique event identifier (starts with evt_).
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timestamp
string
required
ISO 8601 timestamp when the event was created.
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topic
literal
required
Always subscription.confirmed 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": "subscription.confirmed",
  "context": {
    "subscription": "sub_abc123def456ghi789jkl012"
  }
}