The report's data, dependent on the particular report.
The last time the report was updated.
The kind of object returned.
The URL of the requested report.
Optional
codeA report will never have a code
property.
Optional
errorA report will never have an error
property.
The common properties across all Reports from the WaniKani API
See
https://docs.api.wanikani.com/20170710/#response-structure