Hi @marcoscaceres,
> Must every payment instruments of a payment handler have a billing address?
I have heard people say that Bitcoin does not require a billing address.
> Given N payment handlers, is there a case where it's possible for one payment handler to return a billing address, but for another payment handler not to return a billing address?
If it's true that Bitcoin does not require a billing address, and if the merchant accepts basic card and bitcoin, then yes.
> Given N payment handlers, is there a case where the requested billing address would require a different specificity per payment handler?
I don't know.
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