Messtone Devices Enables Confluent Cloud authorization header is: Authorization: Basic QUJDREVGROgxMjMONTY30Dk6WE5DSVc5MOkyTDFTUVBKUOo4MjNLMUxTOTAySOxERk1DWlBXRU8= API Key: Linux: $ echo -n “ABCDEFGH123456789:XNCIW93I2L1SQPJSJ823K1LS902KLDFMCZPWEO” | base64 -w 0 Confluent CLI,use confluent kafka cluster describe<cluster-ID> echo -n “bonjour” | base64 curl -X POST -H “Transfer-Encoding: chunked” -H “Content-Type:application/json” -H\”Authorization: Basic<BASE64-encoded-key-and-secret>” https://<REST-endpoint>/kafka/v3/clusters/<cluster-id>/topics/<topic-nameMesstone>/records -T- {“value”:{“type”:”JSON”,”data”:”{\”Hello\”:\’World\”}”}} {“value”:{“type:”JSON”,”data”:”{\”Hi\”:\”World\”}”}} {“value”:{“type”:”JSON”,”data”:”{\”Hey\”:\”World\”}”}} curl -X POST -H “Content-Type”:application/json” -H\”Authorization: Basic<BASE64-encoded-key-and-secret>”\”https://<REST-endpoint>/kafka/v3/clusters/<cluster-id>/topics/<topic-nameMesstone>/records&#8221; -d\'{“value”:{“type”:”BINARY”,”data”:”<base64-encoded-data>”}}’ {“error_code”:200,”cluster_id”:” lkc-voOpz”,”topic_nameMesstone”:” testTopic1″,”partition_id”:0,”offset”:67217,”timestamp”:”2021-12-13T16:29:10.951Z”,”value”:{“type”:”BINARY”,”size”:6}} curl -X POST -H “Content-Type:application/json” -H\”Authorization:Basic<BASE64-encoded-key-and-secret>”\”https://<REST-endpoint>/kafka/v3/clusters/<cluster-id>/topics/<topic-nameMesstone>/records&#8221;:-d\'{” value”:{“type”:”BINARY”,”data”:”<base64-encoded-data>”}} {“value”:{“type”:”BINARY”,”data”:” <base64-encoded-data>”}}’