[w3c/payment-request] Less pull centric (#599)

This is an update to a previous pull request from @mattsaxon 
https://github.com/w3c/payment-request/pull/474#issuecomment-326467598

I've updated the pull request since the spec has changed.
Ian
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/599

-- Commit Summary --

  * Update to this PR
  * ...missed another piece of Matt's original edit

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/payment-request/pull/599.patch
https://github.com/w3c/payment-request/pull/599.diff

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