[w3c/webpayments-methods-card] Add validate payment method data algorithm (#21)

In combination with https://github.com/w3c/browser-payment-api/pull/381, this fixes #20.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-methods-card/pull/21

-- Commit Summary --

  * Add validate payment method data algorithm

-- File Changes --

    M index.html (22)

-- Patch Links --

https://github.com/w3c/webpayments-methods-card/pull/21.patch
https://github.com/w3c/webpayments-methods-card/pull/21.diff

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https://github.com/w3c/webpayments-methods-card/pull/21