Are you upgrading from FileStore?
This applies if you're currently using the FileStore (NS3) instance of the NetStorage Usage API component and wish to transition to ObjectStore (NS4).
The APIs for ObjectStore (NS4) are a slight superset of FileStore (NS3) APIs. No modification is needed for working NS3 API client code. There is no difference between the APIs which would cause unexpected behavior after upgrading from NS3 to NS4.
There are differences in directory and file logic between NS3 and NS4. Here, you'll find known differences between the two components, to give you an idea of how the transition might affect how you use the NetStorage Usage API.