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Event triggered when the supply start date is set or updated by the grid operator. This can fire more than once for the same subscription if the start date later changes, so handlers should be 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"
  }
}