gistfile1.txt

## Example event wrapped in EventBridge Envelope: 
{
  "id": "6a7e8feb-b491-4cf7-a9f1-bf3703467718",
  "detail-type": "My Test Event",
  "source": "my.event",
  "account": "111122223333",
  "time": "2017-12-22T18:43:48Z",
  "region": "us-west-1",
  "detail": {
    "eventID": "025f12bc455900835ed7abfc08ecf9be",
    "eventName": "INSERT",
    "eventVersion": "1.1",
    "eventSource": "aws:dynamodb",
    "awsRegion": "us-east-1",
    "dynamodb": {
      "ApproximateCreationDateTime": 1647790991,
      "Keys": {
        "lib_id": {
          "S": "participant#acbbb742c7524cecdec7557d60e4a19af0"
        },
        "room_code": {
          "S": "AKPLNR"
        }
      }
    }
  }
}

## Event pattern:
{
  "detail": {
    "dynamodb": {
      "Keys": {
        "lib_id": {
          "S" : [ { "prefix": "participant#" } ]
        }
      }
    }
  }
}