Smart Action User Interface Definitions REST Endpoints

Opportunities/Smart Actions/Smart Action User Interface Definitions
The user interface definitions resource is used to view the user interfaces associated with a smart action. Each user interface can be mapped to a client application. Smart action item or collection links returned in response payloads are valid at the moment the REST request is processed. Any change to the parent object context can invalidate a previously valid smart action.
Get all action navigations (Not Supported)
Method: get
Path: /crmRestApi/resources/11.13.18.05/opportunities/{OptyNumber}/child/smartActions/{opportunities_smartActions_Id}/child/UserActionNavigation
Get an action navigation (Not Supported)
Method: get
Path: /crmRestApi/resources/11.13.18.05/opportunities/{OptyNumber}/child/smartActions/{opportunities_smartActions_Id}/child/UserActionNavigation/{opportunities_smartActions_UserActionNavigation_Id}