Invoro Peppol B2B/B2G E-Invoicing for WHMCS

Peppol B2B/B2G e-invoicing for WHMCS, without the infrastructure

Invoro connects WHMCS to the Peppol network through a certified Access Point. When your customer is in a country with e-invoicing requirements your WHMCS invoices are validated, transformed where needed, and delivered over Peppol AS4 to your customer's accounting system.

You keep WHMCS as your billing system. Invoro handles the network.

What this addon does

Adds a "Send via Peppol" option to WHMCS invoices
Looks up your customer's Peppol participant ID via SMP
Validates the invoice against country-specific Peppol rules
Delivers the invoice over AS4 through Invoro's certified Access Point
Tracks delivery status and writes it back to the WHMCS invoice
Supports webhook callbacks for delivery confirmations and failures

Why a certified Access Point matters

Generating UBL XML is only part of e-invoicing compliance. To actually deliver an invoice over Peppol, you need:

A certified gateway connected to the Peppol network
AS4 transport with valid Peppol certificates
SMP lookup to find recipient endpoints
Country-specific validation (BIS Billing 3.0, XRechnung, KSeF, NemHandel)
SML registration so partners can find you

Invoro provides all of this. You install the addon, connect your Invoro account, and start sending compliant invoices.

Coverage

Currently covering most EU countries within the Peppol Network, full coverage is on our homepage. France (Chorus Pro / PDP) and Italy (SDI / AGID) are not supported.

Pricing

The addon is free. An Invoro account is required to send invoices, plans start at €0/month (send 5 invoice per month for free) with a one-time €20 setup fee. Receiving invoices is unlimited and free on every plan.

About Invoro

Invoro is a listed OpenPeppol Certified Service Provider based in Luxembourg.

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Version Compatibility

Compatible with WHMCS v9.0

Full Version Compatibility

All versions of WHMCS v9.0
All versions of WHMCS v8.13
All versions of WHMCS v8.12
All versions of WHMCS v8.11
Selected versions of WHMCS v8.10
8.10.0
Selected versions of WHMCS v8.9
8.9.0
Selected versions of WHMCS v8.8
8.8.0
All versions of WHMCS v8.7
All versions of WHMCS v8.6
All versions of WHMCS v8.5
All versions of WHMCS v8.4
All versions of WHMCS v8.3
All versions of WHMCS v8.2
All versions of WHMCS v8.1
All versions of WHMCS v8.0

System Requirements

An Invoro account with a B2B API key (free tier available at invoro.eu)
API key scopes: invoice:create, invoice:read, invoice:send (and participant:read for the Peppol Lookup tool)

* Requirements listed are in addition to the WHMCS default system requirements.

Support for this product

The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.

Visit Website Contact Support

Developed By Invoro

Changelog

v1.0.1 Released April 15th, 2026

Latest Version

Added

Initial release.
Send invoices via Peppol through the Invoro B2B API (/invoice-api/invoices/send) - JSON mapping path.
UBL XML import path for WHMCS 8.x+ via POST /invoice-api/invoices/import-xml + POST /invoice-api/invoices/{uuid}/send.
Admin page listing all invoices sent to Invoro with status tracking.
Peppol Lookup admin page: searches the Peppol network by VAT / company name, saves matching Peppol ID to a WHMCS client custom field.
Hooks:
- InvoiceCreated - auto-send when auto_send_trigger = created.
- InvoicePaid - auto-send when auto_send_trigger = paid (default).
- AdminInvoicesControlsOutput - "Send via Peppol" / "Create Peppol Draft" button and status badge on the invoice page.
- AfterCronJob - re-checks non-terminal invoices via StatusTracker (min 5 minutes between polls).
Buyer endpoint resolution: Peppol ID custom field → VAT custom field → OOB Tax ID. Supports VAT-to-Peppol derivation for 30+ EU/EEA countries.
Peppol tax category inference: S standard / K intra-EU reverse charge / G export / Z zero rated.
Credit note (381) / debit note (383) support with positive amounts (WHMCS 9.x type field + pre-9.0 negative-total fallback).
Payment information: seller IBAN / BIC / account name.
Customizable invoice note template with {invoice_url}, {invoice_number}, {due_date} placeholders.
Auto-send filter (all / peppol_only / companies_only / companies_with_peppol).