POP – E-invoicing for Belgium

Turn your WooCommerce orders into Belgian e-invoices: generate the structured UBL XML and a PDF copy for free, then send them over the Peppol network. POP collects the fiscal data at checkout, builds the invoice from each order, handles numbering, VAT treatment and credit notes, and transmits the structured document over Peppol, all from one WordPress workflow, with free and paid plans. This edition is set up for Belgium: the shop country is fixed to Belgium and the delivery channel is Peppol. The Belgian B2B mandate Since January 1st, 2026, structured electronic invoicing over Peppol is mandatory for domestic B2B invoices between VAT-registered businesses established in Belgium. POP turns each WooCommerce order into the required structured document and sends it through the network. Get started without an account Install the plugin and start generating compliant UBL XML and PDF invoices right away, at no cost, with no account and no setup step required. A free monthly generation allowance is included out of the box. When you're ready to send documents over Peppol, a short setup wizard built into the plugin guides you through connecting your free POP account, right inside your WordPress admin. Every plan, including Free, can send over Peppol. Your plan sets your monthly credit allowance, not which features you can use. After you install

1. Generate UBL XML and PDF invoices from your orders straight away, without an account, within the free monthly allowance.
2. When you want to send over Peppol, a short wizard connects a free POP account: email, one-time code, company details.
3. Your first invoice reaches the recipient over Peppol from the same screen.

Who this is built for

• Belgian WooCommerce stores that need every B2B order to become a Peppol invoice
• Stores selling B2B that need VAT treatment, reverse charge and Peppol identifiers handled at checkout
• Agencies and developers running invoicing for Belgian WooCommerce stores

Core features

• Automatic structured e-invoice generation in UBL XML for completed orders
• Branded PDF invoice copy with custom logo and footer text
• Manual PDF and XML download from the order and document management screens
• Credit note generation in XML and PDF, on any plan including Free
• Custom invoice numbering with prefix, suffix, digit length and yearly reset
• Progressive numbering for invoices and credit notes
• Checkout fields for VAT number, company details and Peppol identifier
• VAT number validation at checkout, where supported
• VAT treatment, exemption and reverse-charge configuration with VIES validation
• Automatic blocking of zero-total invoices
• Option to exclude zero-value line items from invoices
• Invoice search and filters by date, type, order status, invoice number and order ID
• Automatic PDF invoice email delivery
• HPOS-ready WooCommerce invoice and document management
• No limit on the number of WordPress installations

Transmission network

• Peppol for Belgian and EU B2B interoperability, where enabled POP supports B2B e-invoicing use cases. B2G use cases are not currently supported.

Integrations

• WooCommerce / WooCommerce Subscriptions / WooCommerce HPOS
• Paid Memberships Pro / Paid Member Subscriptions by Cozmoslabs
• Make / Zapier / Webhook automations
• POP API and direct network connectors

Membership extensions Two small extensions are bundled with the plugin, in the folders addon/for/pmpro and addon/for/cozmos, to invoice membership payments made with Paid Memberships Pro and Paid Member Subscriptions by Cozmoslabs. Each one loads only when its membership plugin is active and you switch it on in the plugin's Integrations tab. They use this plugin's text domain and their own PHP namespaces (WcElectronInvoicePMPro and WcElectronInvoiceCozmos), add no service of their own, and send documents through the same POP service and Peppol channel listed under "External services". For developers POP exposes a REST API, WP-CLI commands (wp popapi invoice search|get|xml|pdf) and an MCP endpoint for AI-assisted and scripted invoicing, plus WordPress Abilities for automation-aware workflows. The API powers the plugin itself; most stores never need to touch it. Supported document formats

• Structured UBL XML e-invoices
• PDF invoice copies as human-readable representations
• XML and PDF credit notes, on any plan including Free

API credits and plans POP is available in five plans: Free, Basic, Growth, Pro and Enterprise. The Free plan includes 10 API credits per month. Every plan, including Free, can send over Peppol. Your plan sets your monthly credit allowance and overquota rate, not which features you can use. A credit is the unit used to measure credit-consuming API operations, such as generating or validating XML or submitting a document over Peppol. Credit consumption depends on the operation performed. For paid features, visit: https://popapi.io/pricing/. Supported payment methods

• Cash
• Bank Transfer
• Check
• Payment Cards
• SEPA Direct Debit

Compatibility

• WooCommerce: 9.x.x or higher, with HPOS support
• PHP: 7.4 or higher
• WordPress: 6.0 or higher

Why POP E-commerce invoicing is becoming more structured and more connected to national systems. A Belgian WooCommerce store needs to collect the right fiscal data at checkout, generate the structured UBL invoice, send it over Peppol, manage credit notes and keep the files available for accounting or customer support. POP was created to make European e-invoicing easier for e-commerce teams: less manual work, fewer disconnected tools and a clearer path from order data to structured invoice documents. We can't make compliance sexy, only easier.

This section describes how to install and run the plugin.

1. Upload the 'pop-e-invoicing-for-belgium' folder to the /wp-content/plugins/ directory.
2. Activate POP – E-invoicing for Belgium from the WordPress 'Plugins' page.

1.0.0

• First release: Belgian e-invoicing for WooCommerce over Peppol. Generate the structured UBL XML and a PDF copy from each order, handle numbering, VAT treatment and credit notes, and send over the Peppol network, on any plan including Free.