[w3c/webpayments] Tweaks (#229)

- validation
- merchantId security
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments/pull/229

-- Commit Summary --

  * ˜
  * Moved
  * Merge remote-tracking branch 'w3c/gh-pages' into gh-pages
  * add bit about validation
  * added security statement re: merchantId

-- File Changes --

    M proposals/method-practice/index.html (15)

-- Patch Links --

https://github.com/w3c/webpayments/pull/229.patch
https://github.com/w3c/webpayments/pull/229.diff

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