List participants

{
  "results": [
    {
      "id": "68b80b8d-8060-42df-bda3-73505a8fdb84",
      "type": "accessKey",
      "status": "active",
      "displayName": "My first email key",
      "avatarUrl": ""
    },
    {
      "id": "8f0b5377-2edc-4116-a8e8-6a475f245a04",
      "type": "contact",
      "status": "active",
      "displayName": "John Doe",
      "avatarUrl": "",
      "contact": {
        "identifierKey": "emailaddress",
        "identifierValue": "john.doe@bird.com",
        "platformAddress": "john.doe@bird.com"
      }
    }
  ]
}