Saby Plugin Extension is a browser extension developed by wasaby, designed to enhance the functionality of the SBIS (System of Business Interaction and Accounting) Plugin. SBIS is an integrated system for communication and accounting, where users can exchange documents, assign tasks, manage accounting, conduct meetings and webinars, search for procurements, and work with clients.

The purpose of the SBIS Plugin is to enable interaction with external devices for electronic signatures, as well as to notify users about new events and work with attached documents. The communication between SBIS and the SBIS Plugin is done through a secure channel called Secure WebSocket.

The SBIS Plugin Extension serves as a backup channel, implemented using Native Messaging Host and WebSocket technologies. In case the main channel based on Secure WebSocket is unavailable, the SBIS Plugin Extension facilitates data exchange, allowing users to utilize digital signatures, process and download standardized documents, perform document scanning, and more.