{
  "header": {
    "messageId": "test-initiate-request",
    "namespace": "Alexa.Media.Playback",
    "name": "Initiate",
    "payloadVersion": "3.0"
  },
  "payload": {
    "requestContext": {
      "user": {
        "accessToken": "ACCESS_TOKEN_PLACEHOLDER"
      }
    },
    "contentId": "CONTENT_ID_PLACEHOLDER"
  }
}