[w3c/payment-method-id] What can I do with a URL-based payment method identifier? (#52)

During a [TAG review of Payment Handler](https://github.com/w3ctag/design-reviews/issues/231#issuecomment-377645336), a reviewer raised concern that it was not clear what a user agent could do with a URL-based payment method identifier. For example, does a manifest live there?

Payment method manifest ingestion is something that we have defined in the [payment method manifest spec](https://w3c.github.io/payment-method-manifest/#ingest), but we should also mention it in this spec.

cc @dbaron

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