Development of a module for the web2poject system

For the web2project management system, it is necessary to develop a module that will allow planning and taking into account cash flows, as well as acts of delivery and acceptance of work. There is mainly a technical task, which will be supplemented in terms of clarifications, including at the request of the developer. By volume, it's:
- some tables in the OBD
- interfaces and php scripts for computation and database table formation

The project is preferably divided into 3 stages, at the end of each stage testing and payment are carried out.