Contributor details are not retrieved by the below single API call
https://rpa.casthighlight.com/WS2/domains/<domain_id>/campaigns/<compaign_id>
Details
For contributor details you need to use the separate API call as explained in the below documentation. It is not possible to retrieve this detail from single API call.
Please refer : https://rpa.casthighlight.com/api-doc/index.html#api-Campaigns-get
Highlight API's
Additional Resources
CAST Highlight Troubleshooting Guides
CAST Highlight Product Documentation
Zendesk Ticket Number
23127
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