CS-07: Note that Apple platforms do not support OpenID4VP over the DC API

[georgepadayatti]

Safari 26 on iOS 26 implements the W3C Digital Credentials API but supports only org-iso-mdoc (ISO 18013-7 Annex C). None of the OpenID4VP protocol identifiers, nor openid4vci-v1, are supported, and Apple restricts the cross-device (hybrid transport) path to Annex C requests as well.

In practice, the flows in section 6.1 to section 6.3 are unavailable on iOS, verifiers and issuers.

Proposed changes

1. Add an informative note to section 8 stating that iOS 26+/Safari 26+ implements the DC API but supports only org-iso-mdoc, so the OpenID4VP-based flows in this CS are not available on Apple platforms and the fallback paths apply.
2. Note that the cross-device path (section 6.2) is likewise unavailable for OpenID4VP requests targeting iOS wallets.
3. Remove the "iOS AuthenticationServices" reference from section 8.1. Apple provides no registration path for OpenID4VP protocols (IdentityDocumentServices covers org-iso-mdoc only).

References

• W3C Digital Credentials API: https://www.w3.org/TR/digital-credentials/
• Platform support matrix: https://digitalcredentials.dev/docs/references/platforms/ios/
• WebKit, "WebKit Features in Safari 26.0": https://webkit.org/blog/17333/webkit-features-in-safari-26-0/#digital-credentials-api