Re: [w3c/payment-handler] Ability to set default instrument for given handler (#173)

> Your proposal (a defaultInstrumentKey) does not on its own give you the necessary second key to be able to distinguish "default" from "all."

It does. The idea would be for the default to have two keys.
To use your example above:

instrumentKey ::= instrumentKeyWhenDisplayedInFullList (Required)
defaultInstrumentKey ::= InstrumentKeyWhenDisplayedAsDefault (Optional - only allowed to be set on one instrument)


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