Returns the metadata for one service or a list of the metadata for all services. Use this without a service code to get the service codes for all services. Use it with a service code, such as <code>AmazonEC2</code>, to get information specific to that service, such as the attribute names available for that service. For example, some of the attribute names available for EC2 are <code>volumeType</code>, <code>maxIopsVolume</code>, <code>operation</code>, <code>locationType</code>, and <code>instanceCapacity10xlarge</code>.

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

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