code: public Optional<String> getValueAsString(String key) {
          Optional<KeyValue> value = getValue(key);
  
          return value.isPresent() ? Optional.of(RequestUtils.decodeBase64(value.get().getValue()))
                  : Optional.<String>empty();
      }
docs: Retrieves a string value for a specific key from the key/value store.
  <p>
  GET /v1/keyValueStore/{key}
  
  @param key The key to retrieve.
  @return An {@link Optional} containing the value as a string or
  {@link java.util.Optional#empty()}