code: public CredentialParams lookup(String correlationId, String key) {
  		synchronized (_lock) {
  			return _items.get(key);
  		}
  	}
docs: Lookups credential parameters by its key.
  
  @param correlationId (optional) transaction id to trace execution through
  call chain.
  @param key           a key to uniquely identify the credential parameters.
  @return resolved credential parameters or null if nothing was found.