{
  "subscription": "projects/test-project/subscriptions/my-subscription",
  "message": {
    "attributes": {
      "attr1":"attr1-value"
    },
    "data": "dGVzdCBtZXNzYWdlIDM=",
    "messageId": "message-id",
    "publishTime":"2021-02-05T04:06:14.109Z",
    "orderingKey": "ordering-key"
  }
}