A specialized AI tool for generating Belgian-compliant Peppol BIS 3.0 e-invoices through natural language processing in Dutch and English.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install nex-einvoice
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install nex-einvoice using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Nex E-Invoice?
Nex E-Invoice is a powerful professional tool designed to bridge the gap between conversational AI and strict financial compliance. This skill allows users to generate UBL format e-invoices, which are mandatory for Belgian B2B transactions starting January 2026. By integrating with Openclaw Skills, it simplifies complex accounting tasks like Belgian VAT (BTW) calculations and Peppol standard adherence through simple text commands in Dutch or English.
The skill provides a complete local-first invoicing solution for freelancers and SMEs, handling everything from customer contact management with VIES validation to the generation of structured payment references. It ensures that businesses stay compliant with digital transformation requirements while maintaining a fast, natural language workflow.
Nex E-Invoice Use Cases
- Automated invoice generation from natural language descriptions in Dutch or English.
- Compliance management for mandatory Belgian B2B e-invoicing standards (Peppol BIS 3.0).
- Real-time tracking of invoice lifecycles including draft, sent, paid, and overdue statuses.
- Simplified VAT reporting with automatic BTW calculation and customer VIES validation.
- Generating credit notes and financial statistics for quarterly tax filings.
How Nex E-Invoice Works
- The user provides a natural language prompt or structured input describing the transaction (e.g., items, quantities, and prices).
- The skill processes the input, validates the customer VAT-ID against the EU VIES database, and calculates the applicable Belgian VAT rates (0%, 6%, 12%, or 21%).
- A local database entry is created, and a unique, sequential invoice number (e.g., INV-2026-0001) is assigned based on the current fiscal year.
- The skill generates a standardized UBL XML file compliant with Peppol BIS 3.0 for seamless export to accounting or e-banking systems.
- Users track the status and payments via CLI commands, updating the internal ledger as payments are received to maintain accurate accounts receivable.
Nex E-Invoice Setup
To begin using this skill within your environment, ensure you have python3 installed and run the initialization script:
bash setup.sh
This command creates the necessary local data directory at ~/.einvoice/, installs dependencies, and allows you to configure your seller company information, including IBAN and VAT details, using the Openclaw Skills framework.
Nex E-Invoice Data Schema & Taxonomy
The skill organizes its data locally to ensure privacy and compliance:
| Data Component | Description |
|---|---|
| Invoice Registry | Tracks status (draft, sent, paid, overdue), amounts, and specific line items. |
| Contact Directory | Stores customer profiles including addresses, emails, and validated VAT-IDs. |
| Financial Config | Manages seller details, IBAN/BIC, and default payment terms (e.g., NET30). |
| UBL Exports | Generates Peppol BIS 3.0 compliant XML files for external software integration. |
Nex E-Invoice Advanced Features
- Sequential invoice numbering that automatically resets or prefixes by fiscal year.
- Automatic detection of Dutch or English input to set the appropriate invoice language.
- Integrated validation for IBAN/BIC formats and international banking standards.
- Advanced search and filtering to query invoices by customer, date range, amount, or status.
- Comprehensive financial analytics for calculating quarterly VAT (BTW) totals and revenue trends.
SKILL.md
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