A scheduling task is made up of operations and resources. The idea is to schedule operations on resources in time so that user-defined constraints are met. The APS PHARIS service is designed to be integrated into another user tool (which serves to control and enter the task). The service takes an input JSON document and exposes an output. As an example of a simple solution, we present the basic technical documentation of the APS PHARIS communication interface (basic complexity class, without further modifications).