Description

POP is the ideal API plugin to manage electronic invoicing directly from your WooCommerce (HPOS-compatible) and WordPress e-commerce.
With POP, you can automatically generate electronic invoices in XML format—ready to dispatch to the tax authorities, your accountant, or any external accounting and automation service.
POP also offers automatic interchange system dispatch, sending your XML invoices directly to the interchange system of the relative country, without any third-party gateways; qualified electronic signature, applying a certified e-signature to every invoice before transmission; and certified digital preservation, archiving all sent invoices for 10 years in full legal compliance with instant retrieval for audits. Designed to simplify tax management for your online store, POP supports sales worldwide and ensures full compliance with European regulations.

What can POP do for you?

Features available in the free version of POP:

Electronic Invoicing

Automatic generation of electronic invoices in XML and PDF format for all received orders
Up to 20 fiscal documents per month included in the free plan
Manual download of invoices in PDF or XML format
Saving of XML files in a local folder on your site
Customization of PDF templates with logo and footer text

Tax Management

Support for tax management of customers in the European Union, and non-EU countries
Configuration of tax regimes and VAT treatments
Regulatory references for exempt transactions

Verification and Data Control

Automatic verification of Tax Code and VAT number through the European VIES system
Custom configuration of invoicing fields: VAT number, Tax Code, Unique Code, and more

Document Numbering and Configuration

Customized numbering of invoices with prefix, suffix, and annual progressive reset
Setting the progressive number for invoices, credit notes, and receipts
Automatic deactivation of document generation with a zero total
Exclusion of products with a zero total from invoices

Management and Reporting

Filters for managing invoices by date, document type, and order status (completed, processing, refunded)
Search invoices by order number or invoice number
Full integration with WooCommerce
No installation limits or integration restrictions with other CMS and management systems

POP API and Integrations

All integrations that were previously offered as paid add-ons—including automatic interchange system dispatch, qualified electronic signature and certified digital preservation—are now built directly into the core of the plugin under the Pro plan. Full connectors to the most widely used accounting software are also bundled in Pro. Thanks to these built-in capabilities, you can automate your entire electronic invoicing workflow—from XML generation and signing through direct dispatch to the interchange system and long-term legal archiving—greatly simplifying tax management for your e-commerce.

Invoice Options

With POP, you can customize invoice management by handling:

Invoice prefix and suffix
Automatic progressive numbering
Custom fields for Unique Code, Tax Code, and more
Automatic sending of PDF invoices via email upon order completion
Invoice display in HTML format

Supported Payment Methods

POP supports several payment methods

Cash
Bank Transfer
Check
Payment Cards
SEPA Direct Debit

Discover what you can do with POP premium plans:

Growth Plan – For growing e-commerce
* Generation of Credit Notes: Easily create and manage credit notes in XML or PDF format.
* XML saving on a remote FTP server: Automatically archive invoices on an external server for safer management.
* Bulk download of XML documents (ZIP): Quickly download multiple documents in a single compressed file.
* Automatic interchange system dispatch: Send your XML invoices directly to the interchange system without relying on third-party gateways.
* Qualified electronic signature: Apply a certified e-signature to every invoice before transmission, ensuring authenticity and integrity.
* Certified digital preservation: Archive all sent invoices for 10 years in full legal compliance, with instant retrieval for audits.
* Webhook integration (POP Webhook) – automatically send invoice data (JSON/XML) to external services like Zapier, Make, N8n, ecc.

Pro Plan – For companies with high volumes
* Management of reverse charge: Automate reverse-charge operations in compliance with European regulations.
* Integration with Fatture in Cloud: automatically send invoices directly from your e-commerce to the Fatture in Cloud service.
* Integration with Aruba Business: automate the sending of invoices via your Aruba Business account.
* interchange system sending via PEC: send invoices to the Interchange System from your PEC box

Enterprise Plan – For software houses and large companies
* Custom solutions and dedicated support for companies with high volumes and specific compliance requirements.
* Advanced features tailored for medium and large enterprises, with options for custom configurations and priority support.

Compatibility

POP is compatible with the latest versions of WordPress and WooCommerce:
* WooCommerce: up to version 9.x.x (HPOS-compatible)
* PHP: 5.6 or higher
* WordPress: 4.6 or higher

We recommend using WordPress 6.x.x and WooCommerce 9.x.x for optimal performance.
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.

Contributions

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

F.A.Q.

Is the POP plugin free?

Yes, POP offers a free version which includes 20 API credits per month. One API credit allows you to generate a fiscal document. To have more credits available and access advanced features, it is necessary to activate a paid plan.

Can I automatically send invoices to tax authorities?

Yes, with the Pro plan you can integrate POP with the tax authorities systems, automating the sending of electronic invoices directly from your e-commerce.

Is it possible to customize invoices generated with POP?

Certainly! You can customize the PDF invoice template by adding your company logo and custom footer text. Furthermore, it is possible to configure invoice prefix, suffix, and progressive numbering.

Does POP support invoicing for foreign customers?

Yes, POP is designed to support tax management for customers within the European Union as well as worldwide sales, in compliance with current regulations.

Is it possible to generate Credit Notes with POP?

Yes, starting from the Growth plan, you can generate and manage Credit Notes in XML or PDF format directly from the plugin.

Does the plugin offer customer support?

Yes. For support requests, you can contact us directly via the support link in the plugin or open a ticket from our official website.

Requirements

PHP: >= 5.6
WordPress: >= 4.6

Screenshots

Installation

This section describes how to install and run the plugin.
1. Upload the ‘woopop-electronic-invoice-free’ folder to the /wp-content/plugins/ directory.
2. Activate POP – European electronic invoicing for e-commerce (ex-WooPop) from the WordPress ‘Plugins’ page.

Reviews

matteo2 October 5, 2023 1 reply

Woopop è plugin perfetto e automatizzato che ha risparmiato molto lavoro manuale in amministrazione. L’integrazione è abbastanza semplice e in poco si può avere il sistema online correttamente. Altra nota positiva è l’assistenza nel caso in cui si riscontrino dei problemi dovuti per esempio a eventuali aggiornamenti di woocommerce. Consigliato

johnatan72 September 14, 2023 1 reply

Cordiali e gentili anche con chi non usa la versione premium. Il plugin funziona bene e si vede che è prodotto da chi sa fare bene il proprio mestiere.

jessicalancia93 October 7, 2021

Versione gratuita buona, permette di registrare partita iva/codice fiscale del cliente e di esportare una versione XML della fattura, da poter poi caricare sui più comuni servizi di fatturazione elettronica. Grazie!

pherio August 27, 2021

WooPop è la soluzione perfetta per la fatturazione elettronica del nostro business. Gestiamo una piattaforma di eventi online e prodotti virtuali, con WooPop abbiamo finalmente trovato la soluzione perfetta per emettere le fatture elettroniche anche verso i nostri clienti che si trovano quasi tutti all’estero. Alfio offre un’assistenza fantastica, rispondendo a tutti i nostri quesiti in maniera precisa e rapidissima. Dopo alcuni mesi di utilizzo di WooPop abbiamo richiesto anche lo sviluppo di un’integrazione ulteriore che automatizza l’invio della fattura elettronica attraverso il nostro gestionale commerciale, per cui ora tutto il processo è automatizzato, dall’ordine del cliente all’invio della fattura elettronica all’agenzia delle entrate. Un plugin fantastico creato da un altrettanto fantastico developer, sempre disponibile a rispondere a qualsiasi dubbio e risolvere ogni problema in tempi velocissimi! Consigliatissimo!

stefanando April 23, 2021

Ottimo plugin, dopo averlo provato (anche con un’utile demo) abbiamo acquistato la versione completa. Una volta collegato a Smart Hub (il gestionale che usiamo) ci ha permesso di risparmiare tutto il tempo che in passato dedicavamo a inserire i clienti in anagrafica e fare le fatture. Una volta configurato si occupa di fare le fatture, che possono poi essere esportate singolarmente o insieme, e importate in Smart Hub, che poi le invia allo SDI. Per le piccole difficoltà e i dubbi incontrati siamo stati aiutati in tempo reale dall’ottima assistenza, e ora tutto fluisce benissimo. Grazie!

markkim May 27, 2020

È un plug-in molto completo per le fatture elettroniche. Si occupa anche dei problemi legati alla fatturazione sia all’interno che all’esterno della comunità europea, controllando anche le partite IVA con VIES. Lo sviluppatore è anche molto disponibile e veloce per correggere eventuali problemi e modifiche che potresti richiedere.

Read all 6 reviews

Contributors & Developers

“POP – European electronic invoicing for e-commerce (ex-WooPop)” is open source software. The following people have contributed to this plugin.

Translate “POP – European electronic invoicing for e-commerce (ex-WooPop)” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Changelog

6.2.5 – 14/07/2025

Fix: Call to a member function format() on null – InvoiceFields.php:788
Add: support for revolut_cc to getPaymentMethodInvoiceCode
Add: Support for San Marino, XML creation and SdI submission for companies and freelancers, PDF creation for private clients
Improved: SdI via POP notification error message – add error list

6.2.4 – 09/07/2025

Fix: filterRefundedOrders for multi refund
Fix: get_invoice_sent, get_invoice_sent_timestamp, set_invoice_sent and set_invoice_sent_timestamp order id (refund order id used)
Fix: error “Provider name is required”

6.2.3 – 08/07/2025

Fix: src/WooCommerce/Providers/OrderRefund get_order_number_invoice meta key
Fix: credit note action for SdI via POP and Webhook
Fix: style actions button

6.2.2 – 07/07/2025

Add: Webhook integration (POP Webhook) – automatically send invoice data to external services via JSON or XML.
Add: Added UI on popapi.io > My Account > Integrations > POP to Webhook > Connect to create and manage custom webhooks (name, URL, format).
Add: Plugin settings section under Advanced > Webhook to activate webhooks and configure webhook ID.
Add: Option to enable CRON-based automation for webhook data delivery.
Add: Flattened JSON structure for better compatibility with Zapier, Make.com, Google Sheets and other no-code tools.
Add: Arrays (e.g., order_items) are now dynamically indexed (order_items_0, order_items_1, etc.) for easier parsing.
Add: Proper Content-Type header based on selected format (JSON or XML).
Add: Fallback error message if webhook is not properly configured or data is missing.
Improved: Better separation of logic for encoding and sending webhook data for maintainability and clarity.

6.2.1 – 07/07/2025

Fix: Undefined property

6.2.0 – 30/06/2025

Add: added SDI integration via POP for direct sending to SDI
Add: filter “pop_use_local_cache”
Add: integration SDI via POP
Add: style for integration SDI via POP
Add: class InvoiceApi
Add: scripts ajax call create and notify for SDI via POP
Add: user_level localized var for admin.js
Add: filter w3tc_can_print_comment, delete comments from XML
Add: added configuration update request when requesting license update to align any changed data based on the active level
Improve: I show invoice data inside the order and in the woocommerce order list even in the “suspended” status if there is a previously created invoice number

6.1.9 – 04/06/2025

Fix: getMimeType function (application/xml and text/xml)
Add: filter “wc_el_inv-invoice-number” to invoiceNumber

6.1.8 – 29/05/2025

Fix: returnLocalFile for DOING_CRON context
Fix: createFromCloud > popApi result for DOING_CRON context
Fix: check the order status set during the invoice creation flow
Fix: minor style fix
Add: getMimeType function

6.1.7 – 21/05/2025

Fix: wizard flow
Fix: discount unit

6.1.6 – 20/05/2025

Fix: Refactored PDF generation via REST API for authenticated access
Fix: xml/pdf file name format
Fix: Normalize type for XML (no XML format for receipt)
Fix: remove abs for fee total_tax
Fix: Cannot declare class (WooPopEmails > emailClasses)

6.1.5 – 28/04/2025

Add: update level info button
Fix: code optimization and cleanup
Improve: API performance

6.1.4 – 22/04/2025

Add: support for “scalapay” payment method
Add: getPaymentMethodInvoiceCode and return MP08 as fallback when mapped methods do not match
Fix: DatiTrasmissione for Aruba addon
Fix: checked uploadFileName property Aruba response
Fix: paymentMethodCode

6.1.3 – 11/04/2025

Fix: check mime_content_type

6.1.2 – 10/04/2025

Fix: Create XML API params
Fix: Allowed addon update by level
Fix: Set default number_next_invoice and invoice_required
Fix: filename param
Fix: returnLocalFile enhanced file access security by validating file paths and types.

6.1.1 – 09/04/2025

Update version and readme

6.1.0 – 31/03/2025

Fix: removed the options un used for ES account
Improve: configuration panel
Add: API v2 introduced
Add: clear cached legal files on account change

6.0.5 – 12/03/2025

Fix: Call to a member function get_sku() on bool
Fix: The queried order is useful only when requesting single items
Fix: popApi function should always return a string
Fix: invoice table limit query to 500 results
Fix: optimizations for getOrder and getOrders
Fix: ES language
Dev: two filters “wc_el_inv-list-orders-limit-default” and “wc_el_inv-list-orders-limit-max”

6.0.4 – 10/03/2025

Fix: code work flow for attachment PDF
Improved: invoice date, added custom meta to set date for processing status

6.0.3 – 07/03/2025

Fix: allowed addon request
Add: button for update allowed addon data from level

6.0.2 – 03/03/2025

Fix: request api

6.0.1 – 28/02/2025

Fix: getCurrentLanguage error

6.0.0 – 27/02/2025

Starting from this version, the Pro version has been fully integrated into the core plugin.
This means a single, more powerful solution with all features included by default.

3.3.4 – 23/01/2025

Add: POP customer notifications

3.3.3 – 28/10/2024

Fix: string localization

3.3.2 – 11/10/2024

Update version

3.3.1 – 18/11/2023

Fix: toggleBillingCompany (receipt and reset event)

3.3.0 – 17/10/2023

Add: XML tag ScontoMaggiorazione for discount
Add: Support for High-Performance Order Storage
Fix: choiceType method, icon for receipt (credit note)
Fix: admin style

3.2.2 – 11/09/2023

Fix: checkout validation (conditions)
Fix: checkout process (conditions)

3.2.1 – 08/07/2023

Fix: checkout invoice type empty check
Fix: tax code billing field validation for association
Fix: billing fields HTML Injection
Add: support for WooCommerce 7.8.x

3.2.0 – 02/01/2023

Fix: minor fix
Add: support for WooCommerce 7.2.x
Improve: moved general invoice options

3.1.3 – 28/11/2022

Fix: sprintf() arguments

3.1.2 – 27/11/2022

Fix: minor fix
Add: support for WordPress 6.1.x
Add: support for WooCommerce 7.1.x

3.1.1 – 28/10/2022

Add: support for WooCommerce 7.x.x

3.1.0 – 20/10/2022

Fix: wcOrderClassName class name check
Add: support payment_method igfs Credit Card (PagOnline Imprese)

3.0.4 – 10/10/2022

Fix: billing_company required if customer type is “company”
Dev: Add filter hook invoice Field args “billing_invoice_field_args”

3.0.3 – 14/09/2022

Add: support for WooCommerce 6.9.x
Add: information and controls for the main options to configure

3.0.2 – 24/07/2022

Fix: create xml query bug
Add: support for WooCommerce 6.7.x

3.0.1 – 15/07/2022

Fix: create pdf
Fix: create pdf generate limit

3.0.0 – 24/06/2022

Add: support for WordPress 6.0.x
Add: support for WooCommerce 6.6.x
Add: Download of XML invoices for the last 5 orders
Fix: various style fix

2.0.4 – 25/05/2022

Fix: list order XmlOrderListTable (unset order) if Invoice order not sent and order total is equal total refunded or order total is zero
Add: support payment_method soisy
Add: payment method info in the invoice table

2.0.3 – 24/05/2022

Fix: filter_var support for PHP >= 8.1

2.0.2 – 22/05/2022

Fix: optimization code and clear unnecessary
Fix: filter_input, filter_var filter for PHP >= 8.1

2.0.1 – 21/05/2022

Fix: Error due to missing file vendor

2.0.0 – 20/05/2022

Dev: autoload psr-4
Update: admin style
Add: support for WooCommerce 6.5.x
Add: support for WordPress 5.9.x

1.3.3 – 17/11/2021

Fix: minor fix.
Add: support for WooCommerce 5.9.x
Add: support for WordPress 5.8.x

1.3.2 – 01/09/2021

Add: support for WooCommerce 5.6.x
Add: support for WordPress 5.8.x

1.3.1 – 12/05/2021

Fix: minor fix and update description.

1.3.0 – 08/05/2021

Add: support for WooCommerce 5.2.x
Add: support for WordPress 5.7.x

1.2.0 – 30/03/2020

Fix: support for WooCommerce 4.0.0

1.1.1 – 05/06/2019

Fix: check on vat if you choose the receipt

1.1.0 – 08/05/2019

Add: Receipt PDF template
Add: Option to choose the type of document (invoice or receipt) in the checkout
Tweak: Order/invoice list table layout

1.0.0

Initial release