curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/processes/signals/subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "items": [
    {
      "externalId": "my.known.id",
      "sink": {
        "externalId": "my.known.id"
      },
      "filter": {
        "resource": "<string>",
        "category": [
          "<string>"
        ],
        "extractorExternalId": "<string>",
        "extractorVersion": "<string>"
      }
    }
  ]
}
'

{
  "items": [
    {
      "externalId": "my.known.id",
      "sink": {
        "externalId": "my.known.id"
      },
      "filter": {
        "resource": "<string>",
        "category": [
          "<string>"
        ],
        "extractorExternalId": "<string>",
        "extractorVersion": "<string>"
      },
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000
    }
  ]
}