From Singapore's InvoiceNow mandate (IMDA, Nov 2025) to cross-border MY↔SG document exchange and the pioneering C5 IRAS GST automation model — end-to-end Peppol Access Point development, personally built.
Peppol (Pan-European Public Procurement On-Line) is an international open standard for electronic business document exchange. Unlike Malaysia's e-Invoice which is a single-country tax mandate, Peppol is an interoperable network that connects businesses, Access Points, and tax authorities across borders.
The originating business generates the invoice in Peppol BIS Billing 3.0 format with country-specific extensions.
An IMDA-certified or OpenPeppol-certified Access Point transmits the document over the Peppol network using the AS4 protocol.
The receiver's Access Point retrieves the document. For cross-border trades, the SMP/SML routing layer handles discovery and delivery.
The buyer receives the structured invoice directly into their ERP or accounting system — no email, no PDF re-keying, complete audit trail.
AS4 is the messaging backbone of Peppol — a reliable, signed, encrypted protocol for B2B document transport. All Access Points must implement AS4 to be Peppol-certified.
SMP stores each participant's capabilities. SML is the central DNS-like registry. Together they enable any C2 Access Point to discover and route to any C3 Access Point globally.
Peppol BIS Billing 3.0 (aligned with EN16931) is the standard invoice format — based on UBL 2.1 XML with Peppol-specific constraints. Country extensions add local fields.
The Peppol network spans 50+ countries across Europe, Asia-Pacific, and beyond. Adoption is accelerating — driven by government procurement mandates and tax authority integration.
Singapore has built the most technically advanced Peppol implementation in the world — mandating not just B2B document exchange, but direct tax authority integration via the pioneering 5th Corner (C5) model with IRAS.
Singapore pioneered the 5th Corner — IRAS as an additional recipient of invoice data. This transforms Peppol from a B2B network into a B2B2G (business-to-business-to-government) infrastructure.
Invoice generated in Peppol BIS Billing 3.0 with Singapore-specific extensions — GST treatment codes (SR, ZR, ES33, etc.) and PayNow payment reference.
AP must hold IMDA certification. Transmits document using AS4 messaging protocol. Sender's Peppol ID (registered in SML/SMP) determines routing to the receiver's AP.
Receiver's IMDA-certified AP retrieves the document. For cross-border MY↔SG trade, Malaysia's MDEC interoperability layer routes documents between the two Peppol environments.
Buyer receives the structured invoice directly into their ERP — no email attachment, no PDF re-keying, complete audit trail with GST codes and PayNow reference.
IRAS receives GST-relevant invoice data directly from Access Points — parallel to C3→C4. Enables automated pre-population of GST F5/F7 returns, eliminating manual reconciliation for qualifying transactions.
The AP must implement AS4 (OASIS AS4 profile) for secure document transport. Foundation of Peppol connectivity — any AP without AS4 is not Peppol-compliant.
Not all APs support C5. If you need automated GST return pre-filling, your AP must be on the IMDA C5-capable AP list.
Your Peppol ID must be registered in the SMP so other APs can discover and route documents to you. Your AP handles this on your behalf.
Verify the AP supports all document types: BIS 3.0 Invoices, Credit Notes, Orders, and Singapore-specific extensions (GST codes, PayNow).
The only specialist who has personally implemented both sides of this connection — Malaysia e-Invoice (LHDN) and Singapore Peppol integration (IMDA). Cross-border MY↔SG advisory is my strongest capability.
Every item below reflects hands-on work in production Peppol environments — from Access Point onboarding through to C5 IRAS forwarding.
End-to-end Access Point onboarding and connectivity — verified against the IMDA AP register. Connected, tested, and live in the Singapore InvoiceNow environment.
Protocol-level implementation of AS4 — signed and encrypted transport, acknowledgement handling, error reporting, and message retry configuration.
Peppol participant registration in the SML, SMP capability publication, and Peppol ID provisioning for new businesses joining the network.
Internal ERP invoice data mapped to Peppol BIS Billing 3.0 format — all mandatory fields, optional extensions, and Singapore-specific BIS additions.
GST treatment code extraction and validation, IRAS C5 endpoint handshake, invoice-to-GST-return data forwarding, and reconciliation logic — personally built and tested.
MDEC interoperability layer configuration for cross-border document exchange between Malaysia and Singapore Peppol environments — both directions.
Singapore-specific BIS extensions: GST treatment code mapping (SR, ZR, ES33, OS, OP), PayNow payment reference, and SG-specific validation rules.
Peppol AP integration with SAP, Oracle, and Xero — bidirectional invoice exchange, status synchronisation, and error-handling workflows.
Evaluate and connect to an IMDA-certified Peppol Access Point. Covers AP selection, SMP/SML registration, Peppol ID provisioning, and IMDA certification verification.
Map your invoice data to Peppol BIS Billing 3.0 and PINT SG — mandatory fields, optional extensions, Singapore GST codes, and PayNow reference.
Prepare your business to exchange Peppol documents with trading partners in Singapore, Australia, EU — including MDEC interop for MY↔SG exchange.
Country-by-country Peppol status matrix, authority requirements, and implementation priority framework for companies planning regional AP/AR digitalisation.
Connect your Access Point to Singapore's IRAS as the 5th corner — automated GST data forwarding, eliminating manual F5/F7 reconciliation for qualifying transactions.
Peppol connectivity is increasingly relevant across a wide range of business types — from exporters to shared service centres.
Companies invoicing Singaporean GST-registered customers need Peppol connectivity. I help you comply on both sides of the Causeway.
Regional businesses with subsidiaries in Malaysia, Singapore, and beyond. Unified AP/AR digitalisation across multiple Peppol Authority jurisdictions.
SSCs managing regional invoice processing. Peppol connectivity and LHDN/IRAS compliance from a single specialist reduces vendor complexity.
GST-registered companies needing InvoiceNow compliance. AP selection, IMDA onboarding, C5 configuration, and BIS 3.0 implementation.
Companies in Japan, Vietnam, Thailand, or other markets entering the Peppol network. Early-mover advisory on authority requirements and AP selection.
Software companies building Peppol connectivity into their products. Technical advisory on BIS 3.0, AS4, SMP/SML, and C5 integration architecture.
This page gives you the broad picture. For deeper dives, visit the dedicated pages below.
PINT SG profile, Peppol BIS 3.0, and the roadmap to BIS 4.0 — plus IMDA certification requirements and C5 IRAS setup.
Plain-English explanations of the Peppol network — Access Points, SMP, SML, AS4, Pre/Post Award, and eDelivery, written by someone who has built it.
Singapore InvoiceNow is now live for all GST-registered businesses. First consultation is complimentary — let's map your Peppol readiness.
hello@peppwise.com