A demo execution is available in the demo.py file, easily usable by executing "python demo.py" in the project's folder.
The data folder contains a sample entities csv file that defines a set of entities that hold currency. The entities can be either of 'person' or of 'company' type. As an assumption, Companies cannot performs payments but they can receive payments.
The code is clearly documented following the NumPy/SciPy Docstrings template.