| Legal acts and regulations | Notifications and clarifications for payers | API description of the controlling body’s fiscal server |
| Electronic trust services | List of the STS’s officials responsible for interaction with business entities during the RCO testing | Actual questions and answers |
| Forms of the software RCO | Software Registrars of Settlement Operations | Search for a fiscal check |
| Presentation materials on the introduction of Software Registrars of Settlement Operations | Video tutorials | Question of the day on usage of Registrars of Settlement Operations / Software version |
| Free PRRO user guide (WEB, Android, iOS, Windows) | Answers to questions about registration and use of RRO/PRRO | Confidentiality policy of free software solution of the State Tax Service (PRRO) |
