A list of URIs for the different size variants of the photo. The list will have entries for original, web, and thumbnail. If the photo has been annotated it will contain entries for original_annotation, web_annotation, and thumbnail_annotation.
The MD5 hash of the photo
Indicates whether the photo is for internal use only and should not be used in marketing or other public materials
Timestamp when the Photo was captured
Timestamp when the photo was created on the server. This may differ from the captured_at field.