POP – e-invoicing for WooCommerce: SdI, PEPPOL, KSeF (ex-WooPop)

Description

Turn your WooCommerce orders into compliant electronic invoices: generate XML and PDF for free, then send them to SdI (Italy), PEPPOL (Belgium and the EU), KSeF (Poland) or ZUGFeRD (Germany).

POP collects the fiscal data at checkout, generates the invoice from each order, handles numbering, VAT treatment and credit notes, and transmits the structured XML to the official network, all from one WordPress workflow, with free and paid plans.

Get started without an account

Install the plugin and start generating compliant 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 through a supported network like SdI, PEPPOL or KSeF, or connect a provider such as Fatture in Cloud, Aruba, Zoho or PEC, a short setup wizard built directly into the plugin guides you through connecting your free POP account, right inside your WordPress admin.

Every plan, including Free, can use every supported network and integration. Your plan sets your monthly credit allowance, not which features you can use.

After you install

1. Generate XML and PDF invoices from your orders straight away, without an account, within the free monthly allowance.
2. When you want to send to a network, a 4-step wizard connects a free POP account: email, one-time code, company details, pick a channel.
3. Your first invoice reaches SdI (or PEPPOL / KSeF) from the same screen.

Who POP is built for

• Italian WooCommerce stores that need every order to become an SdI invoice automatically
• Sole traders and flat-rate (“forfettario”) businesses covered by Italy’s 2024 e-invoicing obligation
• Stores selling B2B cross-border that need VAT treatment, reverse charge and PEPPOL handled
• Agencies and developers running invoicing for multiple WooCommerce stores

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 workflow, on any plan including Free
• 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

Supported countries and workflows

POP works at two levels depending on the country, endpoint and configured integration, on any plan including Free.

Full compliance solution:

• Italy and San Marino: structured XML invoice generation, SdI transmission, and electronic signature or compliant archiving where enabled by the selected workflow
• Belgium: structured B2B e-invoicing and PEPPOL transmission (mandatory for domestic B2B between VAT-registered businesses since January 1st, 2026)

Format generation and network submission where your endpoint supports it:

• Germany: ZUGFeRD / Factur-X and PEPPOL documents
• France, Netherlands, United Kingdom: PEPPOL-based workflows
• Poland: KSeF structured XML transmission

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. Coverage is expanding; more markets are on the roadmap.

For developers

POP also 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 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, on any plan including Free
• 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 10 API credits per month.

Every plan, including Free, can use every supported network and integration: SdI, PEPPOL, KSeF, ZUGFeRD, Zoho, Aruba, Fatture in Cloud and PEC are all available regardless of plan. 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, submitting a document to a supported network, applying an electronic signature or activating compliant archiving when enabled. Credit consumption depends on the operation performed, 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 – e-invoicing for WooCommerce (ex-WooPop)” is open source software.
Contribute to its development to continuously improve the plugin!

External services

This plugin is a client for POP (popapi.io), an e-invoicing service run by the same developer. Depending on the features you switch on, it also connects to the services below. It does not contact any other third-party service.

POP (popapi.io)

POP is the cloud service that builds the structured XML and PDF documents, sends them over the delivery channels (SdI, PEPPOL, KSeF, ZUGFeRD or Zoho via POP) and holds your account and plan. Generating documents works without an account, within a free monthly allowance; a POP account is needed to send documents and to use a paid plan.

What is sent, and when:

• Each time a document is generated (an invoice, a credit note, a receipt or a PDF, whether you ask for it or it runs automatically when an order reaches the status you chose): the order and fiscal data needed for the document (seller and customer details such as names, addresses, VAT and company numbers and contact details, order lines and amounts).
• When you send a document through a delivery channel, or check its delivery status: the document data or its identifier, with your license key.
• When you connect your account with the setup wizard: the e-mail address you enter, the one-time code, your company and fiscal details, the country and channels you choose, the consents you tick and the name of this plugin, so we know which POP plugin the account was created from.
• When your license or plan is checked or refreshed (after connecting, and when you save the license settings): your site title and address, the plugin and WordPress versions and your license key.
• Only if you turn on “Share anonymous usage data” (off by default): your site address, the versions of POP, WordPress, WooCommerce and PHP, the site language and whether it is a multisite. They are sent once when you turn it on and then about once a week, or when the plugin version changes. Turning it off stops it immediately.
• If you send feedback in the deactivation survey while your account is connected: the reason you choose, your optional message and your site address.
• When you open the plugin’s settings page, the plugin retrieves short notices published by POP. This is a read-only request that sends no site data.

Service provided by POP: Terms and conditions, Privacy policy.

VIES (European Commission)

When VAT number validation is switched on in the plugin settings (or when you validate a VAT number manually), the plugin asks the European Commission’s VIES service whether an EU VAT number is valid. Only the VAT number (country code and number) is sent, at the moment it is checked.

Service provided by the European Commission: VIES VAT number validation, Legal notice, Privacy policy.

Fatture in Cloud

Only if you switch on the Fatture in Cloud integration. The plugin sends the invoice, credit note or receipt data of your orders to Fatture in Cloud (api-v2.fattureincloud.it), using the account you authorise, to create the document there and, if you enable that option, to keep stock in sync. It is sent when a document is created or updated and when you connect the account.

Service provided by Fatture in Cloud: Terms, Privacy policy.

Aruba Business

Only if you switch on the Aruba Business integration. The plugin sends the invoice XML to Aruba’s e-invoicing web service (ws.fatturazioneelettronica.aruba.it), signing in with your Aruba credentials, so that it is transmitted to SdI, and asks for its delivery status. It is sent when you send an invoice and when its status is checked.

Service provided by Aruba: Terms and conditions, Privacy policy.

SdI via PEC

Only if you switch on SdI via PEC. The plugin sends the invoice XML by e-mail, through the SMTP server and the certified mailbox (PEC) you configure, to the SdI address. No POP or other third-party server takes part: the mail provider is your own.

Slack (optional notifications)

Only if you enter a Slack token and channel in the settings of the Fatture in Cloud, Aruba or SdI via PEC integrations. The plugin posts short status or error messages about the invoices the integration sends (for example when sending an invoice fails) to Slack (slack.com/api/chat.postMessage).

Service provided by Slack: Terms of service, Privacy policy.

Freshworks (support widget)

On the plugin’s settings page, for administrators only, a support chat widget is loaded from Freshworks (euc-widget.freshworks.com). Freshworks receives your browser and page details and what you write in the chat. It can be turned off with the filter wc_el_inv-enable_freshworks_widget.

Service provided by Freshworks: Terms of service, Privacy policy.

Requirements

PHP: >= 7.4
WordPress: >= 4.6

Technical details

Version	7.1.1
Last updated	September 29, 2026
Active installs	80+
Rating	★★★★★ 4.9/5 (15 reviews)
Requires WordPress	6.0 or higher
Requires PHP	7.4 or higher
Author	POP
Tags	e-invoicing, ksef, peppol, sdi, woocommerce