TrackingCategories returns IDs for both categories and options as follows

<TrackingCategory>
<Name>My Category</Name>
<Status>ACTIVE</Status>
<TrackingCategoryID>a020cd2b-31ac-49a4-b459-f8ffbe854e7c</TrackingCategoryID>
<Options>
<Option>
<TrackingOptionID>dc167d85-6c3a-4261-b7f9-4fda00c2e38d</TrackingOptionID>
<Name>My Option</Name>
</Option>

GET BankTransactions with a bank transaction id specified returns both the category id and name, but only the option name (no id).

<Tracking>
<TrackingCategory>
<Name>My Category Name</Name>
<Option>My Option Name</Option>
<TrackingCategoryID>23333b58-b938-479c-9bdd-5a599bec698c</TrackingCategoryID>
</TrackingCategory>
</Tracking>