Hi @rvm4,
As mentioned on today's call, part of the answer lies in the algorithms of the spec. See, for example:
8.2 Steps to check if an instrument is supported
https://w3c.github.io/webpayments-methods-tokenization/index.html#steps-to-check-if-an-instrument-is-supported
I adapted that text from Basic Card, but it has not been well-reviewed and may need work.
It currently says:
If types is empty and networks is empty, return true.
It might need to say:
If types is empty and networks is empty and cryptograms is empty, return true.
I am inclined to make that change (for consistency with types and networks). Comments welcome!
Ian
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