code: public java.util.List<KeyValue> getProperties() {
          if (properties == null) {
              properties = new com.amazonaws.internal.SdkInternalList<KeyValue>();
          }
          return properties;
      }
docs: <p>
  A list of Java properties that are set when the step runs. You can use these properties to pass key value pairs
  to your main function.
  </p>
  
  @return A list of Java properties that are set when the step runs. You can use these properties to pass key value
  pairs to your main function.