<p>Starts a Synchronous Express state machine execution. <code>StartSyncExecution</code> is not available for <code>STANDARD</code> workflows.</p> <note> <p> <code>StartSyncExecution</code> will return a <code>200 OK</code> response, even if your execution fails, because the status code in the API response doesn't reflect function errors. Error codes are reserved for errors that prevent your execution from running, such as permissions errors, limit errors, or issues with your state machine code and configuration. </p> </note> <note> <p>This API action isn't logged in CloudTrail.</p> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}