The Official Integration for Billingo is a free WordPress plugin designed for users with Billingo subscription packages. It leverages the V3 Billingo API, enhancing the functionality of the plugin. Key features include manual invoice issuance, automated invoice creation, and the ability to handle customer requests for invoice cancellation. Users can send proforma invoices and customize invoice types, with options for traditional or electronic formats.

The plugin supports multiple languages for invoices and allows users to add comments globally or individually. It also includes functionalities for displaying tax identification numbers and managing VAT settings. Payment methods are integrated seamlessly, enabling automatic invoice marking based on payment status. With a built-in notification system, users can automatically email invoices to customers, enhancing order management and administrative efficiency.