POP – Free European electronic invoicing for e-commerce (ex-WooPop)

POP is an e-invoicing compliance plugin for WooCommerce, Paid Memberships Pro and Cozmos PMS. It focuses on structured XML and on the full e-invoicing lifecycle, including generation and validation, network submission and, if enabled, digital signature and compliant archiving. With POP you pay a subscription and receive a monthly allocation of API credits. One credit equals 1 API call, for example: generate or validate XML, submit to a network (SdI, PEPPOL and others), plus signature and archiving when enabled. The principle is simple: you know in advance what you spend, and monthly costs remain predictable. POP supports country-specific e-invoicing workflows for Italy, San Marino and Belgium, including direct delivery to Italy’s Exchange System (SdI) and Belgian structured e-invoicing support. POP can also be used by businesses in the Netherlands, France, Germany and the United Kingdom through PEPPOL, by generating structured UBL-XML and routing invoices via a certified Access Point. Regulatory requirements differ by country, and users should verify their specific obligations.

International PEPPOL Support (NL, FR, DE, UK)

POP enables sending structured XML e-invoices to customers in the Netherlands, France, Germany and the United Kingdom through the PEPPOL International network, using a certified Access Point.

Unlike Belgium, these countries do not require mandatory B2B e-invoicing, but many businesses still request PEPPOL delivery for interoperability or internal compliance. POP provides the technical capability to route invoices internationally. Regulatory requirements may vary by jurisdiction, and users should verify their own obligations.

POP is also available for Shopify: apps.shopify.com/pop-european-invoicing POP is available in five plans (Free, Basic, Growth, Pro and Enterprise). For paid features, visit: https://popapi.io/en/prices/.

Below are the features included in the Free plan.

Document Generation & Delivery

• Automatic generation of XML electronic invoices and PDFs for all completed orders
• Up to 20 API credits/month (1 credit = 1 fiscal document) included in the Free plan
• Descarga manual de facturas en formato PDF o XML
• Local storage of XML files
• Customizable PDF templates with logo and footer text
• Fully compatible with EU e-invoicing workflows

Gestión fiscal

• Support for customers in the European Union and worldwide
• Configuración de regímenes fiscales y tratamientos de IVA
• Referencias normativas para transacciones exentas

Verificación y control de datos

• Automated validation of VAT number and Tax Code via the European VIES system
• Customizable invoicing fields: VAT number, Tax Code, Destination Code and more

Numeración y configuración de documentos

• Fully customizable invoice numbering (prefix, suffix, yearly reset)
• Progressive numbering for invoices, credit notes and receipts
• Automatic blocking of invoices with a zero total
• Exclusion of zero-value line items from invoices

Gestión e informes

• Filters for invoices by date, type and WooCommerce order status
• Search by invoice number or order ID
• Full integration with WooCommerce e-invoicing
• No installation limits or restrictions with other CMS or management systems

Network and supported formats

POP is designed to operate within structured European e-invoicing ecosystems, supporting both national interchange systems and the PEPPOL international network. It enables compliant document generation and routing according to the technical and regulatory requirements of each jurisdiction.

Supported transmission networks

• Italy – SdI (Sistema di Interscambio) Direct transmission of structured XML invoices to the Italian Exchange System (SdI), where B2B and B2C e-invoicing is mandatory.

• PEPPOL network (via certified Access Point) Transmission of structured e-invoices through the PEPPOL international network, including:

• Belgium (mandatory B2B e-invoicing for VAT-registered businesses from January 1st, 2026)

• Netherlands
• France
• Germany
• United Kingdom

In Belgium, structured B2B e-invoicing is implemented via PEPPOL. In other listed countries, PEPPOL delivery may be required contractually or for interoperability purposes, depending on the business context. Regulatory obligations may vary by country and transaction type. Users remain responsible for verifying their specific compliance requirements.

Supported document formats

• Structured XML e-invoices, including UBL where applicable
• PDF invoice copies (human-readable representation)
• Credit notes in XML and PDF format
• Fiscal receipts, where supported by the configured workflow

POP supports B2B e-invoicing use cases. B2G use cases are not currently supported.

API de POP e integraciones externas

POP includes all integrations previously offered as paid add-ons (such as automatic interchange system submission, qualified electronic signature and certified digital preservation), now built directly into the plugin depending on your selected plan. Thanks to these built-in capabilities, POP works as a complete invoice generation plugin, automating XML creation, signing, transmission and long-term preservation through a fully structured, compliant e-invoicing workflow.

Opciones de factura

With POP you can customize your invoicing workflow by configuring:

• Prefijo y sufijo de la factura
• Numeración progresiva automática
• Custom fields (Tax Code, Destination Code and more)
• Automatic sending of PDF invoices via email
• HTML invoice display

Métodos de pago admitidos

• Efectivo
• Transferencia bancaria
• Cheque
• Tarjetas de pago
• Débito directo SEPA

Compatibilidad

POP is compatible with the latest versions of WordPress and WooCommerce: * WooCommerce: up to version 9.x.x; HPOS supported starting from WooCommerce 9.x.x * PHP: 5.6 or higher * WordPress: 4.6 or higher

For HPOS and optimal performance, we recommend using WordPress 6.x.x and WooCommerce 9.x.x and up. We understand how frustrating it can be to navigate complex tax regulations, cumbersome tools, and the fear of making costly mistakes. We’ve been there too. It is precisely from these daily challenges that POP was born: a practical solution to real problems. We didn’t want just another software. We wanted a simple, immediate, and truly useful solution. A way to automate tax management, reduce time wastage, and make room for the growth of your business, without the burden of bureaucracy. POP is born from direct experience. It is designed to be clear, reliable, and perfectly integrated into your daily workflow. We can’t make compliance sexy, only easier.

Contribuciones

«POP – Facturación electrónica europea para e-commerce (ex-WooPop)» es un software de código abierto. ¡Contribuye a su desarrollo para mejorar continuamente el plugin!

Preguntas Frecuentes

¿Es el plugin POP gratuito?

Yes. POP offers a Free plan that includes 20 API credits per month. One credit equals 1 API call. To unlock more credits and advanced compliance features, you can activate a paid plan.

Why does POP use API credits instead of “invoices per month”?

POP is an e-invoicing compliance product. A single invoice may involve multiple compliance actions, such as:

• Generate and validate XML
• Submit XML to a network (SdI, PEPPOL, etc.)
• Apply digital signature (if enabled)
• Activate compliant archiving (if enabled)

Each action corresponds to 1 API call = 1 credit.

¿Puedo enviar automáticamente las facturas a las autoridades fiscales?

With the Growth plan you can integrate POP with the Italian tax authorities system, automating the sending of electronic invoices directly from your e-commerce.

¿Es posible personalizar las facturas generadas con POP?

Sí. Puedes personalizar la plantilla de factura en PDF añadiendo el logotipo de tu empresa y un texto personalizado en el pie de página. También puedes configurar el prefijo, el sufijo y la numeración progresiva de las facturas.

¿Admite POP la facturación a clientes extranjeros?

Yes. POP supports EU and international customers and can route structured XML through supported networks. Regulatory requirements may vary by jurisdiction, and users should verify their specific obligations.

¿Es posible generar abonos con POP?

Sí, a partir del plan «Growth», puedes generar y gestionar abonos en formato XML o PDF directamente desde el plugin.

What happens if I run out of credits?

This answer applies to the WordPress (Open Source) version of POP.

Free plan: the service stops when credits are exhausted. Paid plans: overquota is allowed. Extra API calls are charged according to your plan’s overquota rate. You can upgrade your plan at any time to increase your monthly credit allocation. Credit enforcement rules may differ on non open-source platforms.

Can I use POP only to generate XML without network submission?

Yes. POP can be used exclusively for XML generation and validation.

Network submission, digital signature and compliant archiving are optional modules depending on your workflow and selected plan.

¿Ofrece el plugin soporte al cliente?

Sí. Para solicitudes de soporte, puedes contactarnos directamente a través del enlace de soporte en el plugin o abrir un tique en nuestro sitio web oficial.

Requisitos

PHP: >= 5.6 WordPress: >= 4.6