code: public void store(String correlationId, String key, CredentialParams credential) {
  		synchronized (_lock) {
  			if (credential != null)
  				_items.put(key, credential);
  			else
  				_items.remove(key);
  		}
  	}
docs: Stores credential parameters into the store.
  
  @param correlationId (optional) transaction id to trace execution through
  call chain.
  @param key           a key to uniquely identify the credential parameters.
  @param credential    a credential parameters to be stored.