[w3c/browser-payment-api] Remove restriction that payment method identifier only appear once (#261)

Based on recent discussions about how to support payment modifiers with basic-card and different card types, we agreed that we need to support modifiers with the same identifier but different data. This change removes the restriction on a single identifier and adds the data field to supply the different data.

One use case for this is to support card payments with different modifiers for credit vs. debit cards.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/261

-- Commit Summary --

  * Remove restriction that payment method identifier only appear once

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/261.patch
https://github.com/w3c/browser-payment-api/pull/261.diff

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https://github.com/w3c/browser-payment-api/pull/261