[w3c/payment-request] Validate .data on construction (PR #976)

closes #975 

The following tasks have been completed:

 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)
 * [ ] Has undergone security/privacy review (link)
 
Implementation commitment:

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

Optional, impact on Payment Handler spec?

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

  https://github.com/w3c/payment-request/pull/976

-- Commit Summary --

  * Validate .data on construction

-- File Changes --

    M index.html (18)

-- Patch Links --

https://github.com/w3c/payment-request/pull/976.patch
https://github.com/w3c/payment-request/pull/976.diff

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