POP – European e-invoicing compliance for e-commerce

Complete European e-invoicing system for WordPress and WooCommerce: generate XML and PDF invoices, collect fiscal data, and connect your store to PEPPOL, KSeF, SdI and ZUGFeRD workflows.

POP helps European e-commerce teams automate invoice generation, fiscal checkout fields, document downloads, credit notes and supported network submissions from one WordPress workflow. A complete e-invoicing plugin for WordPress and WooCommerce, available with free and paid plans.

Who POP is built for

• Freelancers and small businesses that need reliable XML and PDF invoices without manual document handling
• Growing e-commerce owners selling across European markets with different fiscal data requirements
• Accountants, agencies and developers managing invoicing workflows for multiple WordPress stores
• Enterprise stores that need predictable API credit usage and a structured path toward country-specific e-invoicing workflows

Core features

• Automatic electronic invoice generation in XML format for completed orders
• Branded PDF invoice generation 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 format, where supported by the selected plan and workflow
• Fiscal receipt support, where supported by the configured country and integration
• Custom invoice numbering with prefix, suffix, digit length and yearly reset
• Progressive numbering for invoices, credit notes and receipts
• Checkout fields for VAT number, tax ID, destination code, PEPPOL ID and other workflow-specific fiscal data
• VAT number and tax ID validation at checkout, where supported
• Tax regime, VAT treatment, exemption and reverse-charge configuration
• 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
• HTML invoice display for customer-facing workflows
• HPOS-ready WooCommerce invoice and document management
• No limit on the number of WordPress installations and supported integrations

Supported transmission networks

• PEPPOL for supported European B2B interoperability workflows, where enabled
• KSeF for structured Polish e-invoicing workflows, where enabled
• SdI for direct transmission of structured XML invoices, where enabled
• ZUGFeRD / Factur-X for supported German hybrid PDF/XML document workflows, where enabled

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

Integrations

POP connects WordPress invoicing workflows with supported e-commerce platforms, membership systems, automation tools, national networks and document providers.

• WooCommerce / WooCommerce Subscriptions / WooCommerce HPOS
• Paid Memberships Pro / Paid Member Subscriptions by Cozmoslabs
• Zoho / Aruba / Fatture in Cloud / PEC [Interchange System]
• Make / Zapier / Webhook automations
• n8n
• POP API, integrations and direct network connectors

POP supports WooCommerce, WooCommerce Subscriptions, Paid Memberships Pro and other WordPress invoicing workflows. It is also available for Shopify: https://apps.shopify.com/pop-european-invoicing

AI and LLM features

• MCP-ready: connect compatible AI assistants to POP invoicing capabilities
• Exposes WordPress Abilities for automation-aware WordPress workflows
• WP-CLI commands (wp popapi invoice search|get|xml|pdf) for agentic operations, scripted checks and developer automation
• API-first design for AI-assisted invoice creation, status checks and document routing

Supported countries and workflows

POP supports selected European e-invoicing workflows depending on the country, endpoint, selected plan and configured integration.

• Germany: PEPPOL and ZUGFeRD-oriented document workflows where supported by the configured endpoint
• France: PEPPOL-based electronic invoicing workflows where supported by the configured endpoint
• United Kingdom: PEPPOL-based electronic invoicing workflows where supported by the configured endpoint
• Italy and San Marino: structured XML invoice generation, SdI transmission starting from the Basic plan, and electronic signature or compliant archiving where enabled by the selected plan and workflow
• Netherlands: PEPPOL-based electronic invoicing workflows where supported by the configured endpoint
• Poland: KSeF structured e-invoicing workflows, including XML transmission to KSeF starting from the Basic plan
• Belgium: structured B2B e-invoicing workflows, including PEPPOL transmission where enabled

Belgium introduced mandatory structured B2B e-invoicing for domestic transactions between VAT-registered businesses from January 1st, 2026. KSeF adoption in Poland is being phased in by taxpayer category. Regulatory obligations, timelines and accepted channels vary by jurisdiction, business type and transaction type; users remain responsible for verifying the requirements that apply to their specific case.

Planned countries

POP is expanding its coverage roadmap for additional markets, including UAE, Slovakia, Croatia, Spain, Romania, Hungary and Greece.

Supported document formats

• Structured XML e-invoices, including UBL where applicable
• PDF invoice copies as human-readable representations
• XML and PDF credit notes, where supported by the selected workflow and plan
• Fiscal receipts, where supported by the configured workflow
• ZUGFeRD document bundles for supported German workflows

API credits and plans

POP is available in five plans: Free, Basic, Growth, Pro and Enterprise. The Free plan includes 20 API credits per month.

A credit is the unit used to measure credit-consuming API operations, such as generating or validating XML, submitting a document to a supported network, applying an electronic signature or activating compliant archiving when enabled. Credit consumption depends on the operation performed, selected plan, country and workflow.

For paid features, visit: https://popapi.io/pricing/.

Supported payment methods

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

Compatibility

POP is compatible with the latest versions of WordPress and WooCommerce:

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

Why POP

E-commerce invoicing is becoming more structured, more local and more connected to national systems. A WooCommerce store may need to collect the right fiscal data at checkout, generate XML invoices, submit documents through SdI, PEPPOL or KSeF, manage credit notes and keep invoice 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.

Contributions

“POP – European electronic invoicing for e-commerce (ex-WooPop)” is open source software. Contribute to its development to continuously improve the plugin!

Requirements

PHP: >= 7.4 WordPress: >= 4.6