[w3c/payment-handler] Update Example6 and Example7 (#290)

closes #128, #280 

This change includes the following things:
  - Use async/await
  - Use correct message handler
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/290

-- Commit Summary --

  * Update Example6 and Example7

-- File Changes --

    M index.html (73)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/290.patch
https://github.com/w3c/payment-handler/pull/290.diff

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https://github.com/w3c/payment-handler/pull/290