Building a VSTO Excel Add-in with SEF API Integration

SEF add-in for Excel: an invoice in an Excel sheet, the add-in ribbon and the About window

Project Overview

SEF Excel add-in development is presented through this VSTO project, which automates the creation, submission and tracking of XML invoices from Excel, with additional options for invoice management and settings.

I develop similar solutions as part of my Office add-in development service.

Project Details

Project Goal

The goal of the project was to enable easier and more efficient management of invoices through automation and facilitate invoice submission to the SEF platform using Excel.

Key Features

  • Invoice created in Excel: The invoice is created within an Excel sheet. The cells to be sent to SEF are defined in a specific table accessible through the add-in.
  • XML invoice creation: Generating XML invoices based on fields in the active Excel sheet.
  • Invoice submission and tracking: Sending invoices, checking their status, and the option to cancel.
  • Export to PDF: Exporting the page to PDF format after successful submission.
  • Decimal separator adjustment: Changing the decimal separator globally in Excel.
  • Support for public institutions: The ability to send invoices to public institutions and add links to additional documents.

Technologies Used

  • C# programming language: Used for add-in development.
  • Microsoft VSTO: Technology for creating add-ins for Microsoft Office.
  • SEF API: Integration with the API for sending and managing invoices.

Products Used