Peppol e-invoicing roadmap urgency - Belgium B2B mandate now in effect

[BENELUX]

Hi all,

WHMCS 9.0 is now in General Availability (Jan 20, 2026), but the planned Peppol BIS Billing 3.0 e-invoicing add-on remains "coming soon" with no ETA.  For those of us operating in Belgium, this is now a critical compliance blocker.

The Issue:
Belgium mandated B2B structured e-invoicing via the Peppol network effective 1 January 2026.  Invoices can no longer be issued in traditional formats, they must be exchanged through Peppol. We cannot delay invoicing any further while waiting for WHMCS native support.

Previous Guidance:
WHMCS Technical Analyst stated in mid-December:  "The e-invoicing functionality will be released as an addon that will be available shortly after v9.0 GA (in January)." Now that v9.0 GA has shipped, this guidance appears to have shifted to "coming soon" with no timeline???

Questions for the WHMCS Team:
1. Is the January add-on still planned, and will it include Peppol BIS Billing 3.0?
2. If not, what interim WHMCS-recommended solution should we use to issue compliant invoices immediately?

For others in the same situation: If you have found a working interim solution or Marketplace module that handles Peppol BIS Billing 3.0 invoicing within WHMCS, please share your experience below.

Thanks

[WHMCS John]

Hi @BENELUX,

Work to implement our e-invoicing solution with direct integration with the Peppol network (BIS Billing 3.0) is in progress.

We are currently in the final stages of polishing the integration and conducting rigorous testing. Given the critical importance of financial compliance, we are prioritising stability to ensure the solution is robust upon release in Q1 2026.