[w3ctag/design-reviews] requesting a TAG review of making the "total" field optional in PaymentRequest API (#512)

Hello TAG!

I'm requesting a TAG review of making the "total" field optional in PaymentRequest API.

Given that when [Digital Product Management API](https://discourse.wicg.io/t/proposal-web-payments-digital-product-management-api/4350) is used with PaymentRequest API, the total amount is unnecessary, we propose to make the “total” field optional in PaymentRequest API spec, along with a few consequent changes.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/w3c/payment-request/issues/912

  - Security and Privacy self-review²: N/A (this proposal has no security and privacy consequence)
  - Primary contacts (and their relationship to the specification):
      - Liquan (Max)Gu (@maxlgu), Chromium
  - Organization/project driving the design: Chromium
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/feature/5226111782879232



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