service-a.properties

security.protocol=SASL_PLAINTEXT
sasl.mechanism=OAUTHBEARER
sasl.jaas.config=org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule required \
  oauth.client.id="service-a" \
  oauth.client.secret="service-a-secret" \
  oauth.token.endpoint.uri="http://keycloak:8080/auth/realms/meetup/protocol/openid-connect/token" ;
sasl.login.callback.handler.class=io.strimzi.kafka.oauth.client.JaasClientOauthLoginCallbackHandler