[w3c/web-based-payment-handler] Allow web-based payment handlers to report back internal error (PR #429)

See #428 and https://github.com/w3c/payment-request/issues/1040

closes #???

The following tasks have been completed:

 * [ ] web platform tests (link)
 * [ ] MDN Docs added (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)


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<a href="https://pr-preview.s3.amazonaws.com/w3c/web-based-payment-handler/pull/429.html" title="Last updated on Mar 4, 2026, 2:01 PM UTC (19de401)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/web-based-payment-handler/429/d20fd52...19de401.html" title="Last updated on Mar 4, 2026, 2:01 PM UTC (19de401)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/web-based-payment-handler/pull/429

-- Commit Summary --

  * Allow web-based payment handlers to report back internal error

-- File Changes --

    M index.html (113)

-- Patch Links --

https://github.com/w3c/web-based-payment-handler/pull/429.patch
https://github.com/w3c/web-based-payment-handler/pull/429.diff

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