Added sort query parameter in GET endpoints

In all Get ImportOperations by an ImportSink Key endpoints, we now support an additional query parameter sort, with which you can sort the createdAt and lastModifiedAt fields with sort options asc (default) or desc. Multiple sorting is also allowed for up to three fields.

Sorting in the Import API works the same way as in the commercetools Composable Commerce HTTP APIs. Please refer to our existing documentation for the commercetools Composable Commerce API for more details.