OpenID Foundation proves real-world interoperability of HAIP 1.0 with OpenID4VP 1.0 and OpenID4VCI 1.0

The OpenID Foundation is proud to announce successful interoperability testing of the High Assurance Interoperability Profile (HAIP) 1.0 draft 05, alongside the Final specifications for OpenID for Verifiable Presentations (OpenID4VP) 1.0 and OpenID for Verifiable Credential Issuance (OpenID4VCI) 1.0. 

Conducted November 6th to 13th, this testing event demonstrated strong results across credential presentation and issuance workflows.

The HAIP 1.0 draft 05 specification is currently in Public Review, with a final vote by the OIDF membership December 9-23, 2025. This interoperability event marks a critical milestone as the specification moves toward finalization.

What the testing set out to achieve

Led by the Digital Credentials Protocol (DCP) Working Group, this interoperability project had four core objectives:

1. Prove out the HAIP 1.0 Editor's Draft (in Public Review, pending final vote in December) spec with OpenID4VP 1.0 Final and OpenID4VCI 1.0 Final, providing any feedback to the DCP WG for consideration.
2. Provide results to interop partners 11/16-18 NZTA organizers and attendees.
3. Provide results to ISO/IEC TC17 18013-7 / WG 10 & 4 Wellington meeting week of 11/18.
4. Prove-out OIDF open source tests.

Strong results across the board

This recent testing demonstrated robust interoperability across both credential presentation and issuance workflows, achieving strong results:

• Testing of OpenID4VP 1.0 combined with HAIP 1.0 and the Digital Credentials API (DC API) achieved a 98% passing rate on 44 pairs across credential types and queries, with the majority of transactions on DC API.
• OpenID4VP 1.0 with HAIP 1.0 and with no DC API achieved a 73% passing rate on 11 pairs.
• OpenID4VCI testing delivered an 82% passing rate on 22 pairs, of which 11 pairs were HAIP mode, and 10 of those passed.

Scope of the testing

The remote only testing covered an extensive range of scenarios. For OpenID4VP testing:

• DC API: 40 pairwise tests
• Non-DC API: 11 tests
• Mdoc and SD-JWT credential types (20 pairs Mdoc and 21 pairs SD-JWT)
• 4 DCQL queries of different sets of data, including NIST specified requirements to Open a Bank Account, and a query for two credential types
• 4 wallets and 5 verifiers participated
• All transactions encrypted
• All wallets except 1 tested with signed transactions, this remaining wallet to complete signed transactions before 11/16-18 interop with NZTA

For OpenID4VCI testing:

• 4 wallets and 5 issuers participated
• 22 total pairs of which many pairwise scenarios to cover spectrum of OpenID4VCI options for HAIP and non-HAIP, all with custom uri initiation
• 19 pairs SD-JWT and 3 mdoc

Diverse global participation

Leading implementers from around the world participated in this testing event, representing diverse platforms, regions, and implementation approaches. This diversity was critical to proving that the specifications work across different technical environments and organizational contexts. Participating organizations included: Mattr, Bundesdruckerei GmbH (bdr), Google Wallet, Panasonic Connect, My Mahi and Meeco.

Stefan Charsley, CTO at MyMahi, said: “For MyMahi, this interop event has provided a valuable opportunity to validate the OpenID4VCI and OpenID4VP implementations of our MyMahi Wallet against issuers and verifiers from around the world, and to discover edge cases resulting in a more rigorous implementations. Using HAIP profiles also proved OpenID standards can achieve end-to-end interoperability while maintaining high security and privacy requirements. We encourage and look forward to our partners adopting OpenID standards for digital credentials.”

Why this demonstration mattered

Over the past 18 months, verifiable credentials have moved from promising prototypes to production pilots in finance, healthcare, transportation, and government services. More recently, the UK.Gov, the Swiss Confederation, and Japan Digital Agency declared their selection of OpenID for Verifiable Presentation in their digital identity projects. Other jurisdictions are poised to follow suit.

This interop event served as critical validation to demonstrate the real-world interoperability of specifications that are on their way to final. To get to this point, there were three key components:

• Standards collaboration - the Foundation's partnerships with W3C, ISO, IETF, and FIDO Alliance underpinned the development of these interoperable standards. Results will be shared with ISO/IEC 18013-7 WG10 to inform their work on online presentation specifications. 
• Conformance testing – the OpenID Foundation developed open source tests for the specifications. Implementers validated their implementations before testing with peers and provided feedback for future implementers. Once finalized, these tests enable self-certification, ensuring all ecosystem participants meet the same high bar for security and interoperability. 
• Remote testing - the event was hosted remotely across multiple time zones, proving that OpenID specifications work across platforms, devices, and credential types.

About the OpenID Foundation

The OpenID Foundation (OIDF) is a global open standards body committed to helping people assert their identity wherever they choose. Founded in 2007, we are a community of technical experts leading the creation of open identity standards that are secure, interoperable, and privacy preserving. The Foundation’s OpenID Connect standard is now used by billions of people across millions of applications. In the last five years, the Financial Grade API has become the standard of choice for Open Banking and Open Data implementations, allowing people to access and share data across entities. Today, the OpenID Foundation’s standards are the connective tissue to enable people to assert their identity and access their data at scale, the scale of the internet, enabling “networks of networks” to interoperate globally. Individuals, companies, governments and non-profits are encouraged to join or participate. Find out more at openid.net.