public void registerCallback(String challenge,ChallengeCallbackPlugin plugin,HttpMessage attack){
  cleanExpiredCallbacks();
  regCallbacks.put(challenge,new RegisteredCallback(plugin,attack));
}

public void registerCallback ( String challenge , ChallengeCallbackPlugin plugin , HttpMessage attack ) { cleanExpiredCallbacks ( ) ; regCallbacks . put ( challenge , new RegisteredCallback ( plugin , attack ) ) ; }
registers a new zap api challenge .
