confirmed_subscription

The double opt-in link was clicked: the subscription is confirmed.

Verifies the claimed edge subscribed_newsletter made, when the device that clicked is known; otherwise the address alone.

Sent with	server, platform keys (see write keys)
Mode	strict: exactly the declared fields; an undeclared key, a wrong type or a missing required key quarantines the event
Version	1 (_schema_version on the stored row)
State	active
Required fields	none
Revenue	none: the revenue block is refused
Identity evidence	device ↔ email, strength 100, verified
Before consent	no

Fields

The activity's own fields, sent as features. Identifier and attribute fields are moved out of features by the processor; see identifiers and attributes.

Field	Type	Required	What happens to it	Meaning
list	string	no, may be null	stays in features	The mailing list the message or the subscription concerns.
message_id	string	no, may be null	stays in features	The sent message, as the mail platform identifies it: the same value on received, opened, clicked and bounced.

Example

One activity in a batch to POST /v1/activities, with debug so the answer says what the processor made of it. The envelope page explains every top-level field.

{
  "batch": [
    {
      "activity_id": "0192f1a4-d136-731f-8000-d13631fd0000",
      "activity": "confirmed_subscription",
      "ts": "2026-10-17T20:00:00+02:00",
      "owner_ref": "own:own_01M4XX0033FV7QXDRB5BQBRPGR",
      "identifiers": [
        {
          "type": "email",
          "value": "ana@example.com"
        },
        {
          "type": "device",
          "value": "evx_web_8f21c0"
        }
      ],
      "features": {
        "list": "summer-fest-2027",
        "message_id": "msg_01M4XVBYC3FGXCPFRZEPGV20RZ"
      }
    }
  ],
  "debug": true
}

Try it

Sends this request from your browser. The key and the endpoint are kept in this browser only.

ServiceWrite key

POST /v1/activities{ "batch": [ { "activity_id": "0192f1a4-d136-731f-8000-d13631fd0000", "activity": "confirmed_subscription", "ts": "2026-10-17T20:00:00+02:00", "owner_ref": "own:own_01M4XX0033FV7QXDRB5BQBRPGR", "identifiers": [ { "type": "email", "value": "ana@example.com" }, { "type": "device", "value": "evx_web_8f21c0" } ], "features": { "list": "summer-fest-2027", "message_id": "msg_01M4XVBYC3FGXCPFRZEPGV20RZ" } } ], "debug": true }

Versions

Version	Mode	Key classes	Change
1 (current)	strict	server, platform	first version

A published version never changes; a change is a new version, and every stored row says which version it was checked against.