private void logRetries(int attempt, Throwable throwable) {
        LOGGER.errorv(throwable, "Attempt {0} to POST event failed. "
             + "A maximum of {1} retries will be attempted.", attempt, ATTEMPTS_COUNT);
    }
Process a {@link org.keycloak.events.EventType#REGISTER} and send to Apiman Manager API via HTTP.
sso/keycloak/extensions/src/main/java/io/apiman/manager/sso/keycloak/event/processors/NewUserEventProcessor.java