[w3c/browser-payment-api] Introduce transaction_id and server callback (#292)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/292

-- Commit Summary --

  * Update index.html

-- File Changes --

    M index.html (52)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/292.patch
https://github.com/w3c/browser-payment-api/pull/292.diff

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