The user guide of the program can be found here.

Codes of goods, works and services used when filling out an electronic invoice
You can get the codes of goods (works and services) intended for the compilation of e-invoices here.

E-invoice file format and samples (updated: 16.02.2018)

Taxpayers who want to automatically design an electronic invoice through their internal information systems can get acquainted with the XML-format of invoice files here.
When preparing an XML file, special characters (&, ", ', <, >) must be replaced with the appropriate equivalent (&, ", ', <, >).
The XML file is scanned by XSD to verify its authenticity. In this case, the XML workspace must have access to http://www.w3.org/2001/XMLSchema, http://xerces.apache.org, http://www.w3.org/2005/xpath-functions