Extracting the List of Resource ID from Groups and Activity ID's from resources.

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Hi ,

       We have a use case in which we have a group having 3 resources , We want to extract list of  Resource ID's from that group using Rest API's . I tried using https://api.etadirect.com/rest/ofscCore/v1/resources/id .   In this the id is the Group id . Is there a possible way with which we could extract Resource Id's of a particular bucket by passing Group ID's in the request .

Similarly we want to extract Activity ID's of a particular resource, by passing the resource id in the request .

Thanks 

Prashant Singh Bhadauria