Create channel member

POST {{_endpoint}}/services/data/v{{version}}/tooling/sobjects/PlatformEventChannelMember

Request Body

{"FullName"=>"Carbon_ComparisonChannel_chn_Carbon_Comparison_e", "Metadata"=>{"eventChannel"=>"Carbon_ComparisonChannel__chn", "selectedEntity"=>"Carbon_Comparison__e", "urls"=>nil}}