[w3c/payment-request] Feat: allow show() to take optional detailsPromise (#672)

 * closes #645 

Should be much easier to review now :)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/672

-- Commit Summary --

  * Feat: allow show() to take optional detailsPromise

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/payment-request/pull/672.patch
https://github.com/w3c/payment-request/pull/672.diff

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https://github.com/w3c/payment-request/pull/672