Please improve the API to use standard page, page size, sort direction, sort field parameters (at very least). This should apply to all requests that fetch a list of records.
For example, the GET /contacts endpoint has limit, startAfter, startAfterId parameters to control pagination but this doesn't allow for sorting.
Plus the parameter naming could be a lot simpler, and using startAfter/startAfterId is not intuitive. It's a lot easier to use something like "page" and "limit" instead.
"page" is actually a working parameter but is not in the API docs. All params should be documented.