Get time off requests changes

Returns an array of all changes made to time off requests within a specified date range. Each item in the array includes: the time off request details at the time of the change, and the type of change, such as created or deleted. Optionally, requests that were changed to status pending can also be included.

Notes:

• The results are filtered by the date the change has occurred (when the request was created or updated), not the start/end date of the time off request itself.
• Each change reflects a snapshot of the time off request's status at the time of the change, and may not reflect the current status.