I have a chat only account using gude.swathi@gmail.com under https://vintec.zendesk.com/

I’m trying to Implement an OAuth authorization flow using Client credentials type by following document : https://developer.zendesk.com/rest_api/docs/chat/auth#confidential-grant-types to make use of chat api

according to above document first I need to set client_type to "confidential" with the Update Client endpoint.

But to update Client , I need to get Clients using basic auth which always gives me ‘Unauthorized’ error.

curl https://www.zopim.com/api/v2/oauth/clients \

  -v -u {email_address}:{password}

I have even tried calling Client credentials grant type directly by skipping above step which gives me error “invalid grant type”

curl https://www.zopim.com/oauth2/token \  -H "Content-Type: application/x-www-form-urlencoded" \  -d 'grant_type=client_credentials&client_id={your_client_id}&client_secret={your_client_secret}' \  -X POST

Please help me or suggest any direction .