GroupKey Interpretaion in REST api

Create a group using GROUP/POST REST API with appCookie say "appCookie": "1".
Retrieve the same using GROUP/GET REST API the response received is GroupKey:0x31
This response received in GET API is not directly usable if one wants to delete the Group using Group/DELETE Rest API. We need to pass the original Key that is used while creating the group.

The GET api returns the hex chars for 1 which is 0x31 and the GROUP/DELETE API expects "1" and not the hexchars as the value for appCookie.