The extension object returned by Tabula has the properties documented below.

id	The unique identifier of the extension
state	The current state of the extension request; Unreviewed, Approved, Rejected or Revoked
expired	A boolean value indicating whether the extension has expired by the time the API request is made.
requestedExpiryDate	The requested expiry date of an extension request in ISO date-time format. This may be null.
expiryDate	The new submission deadline for a student in ISO date-time format. This may be null.