[w3c/webpayments] Add section on merchantID (#202)

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

  https://github.com/w3c/webpayments/pull/202

-- Commit Summary --

  * Add section on merchantID

-- File Changes --

    M proposals/method-practice/index.html (48)

-- Patch Links --

https://github.com/w3c/webpayments/pull/202.patch
https://github.com/w3c/webpayments/pull/202.diff

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