@cmuratori Because in several European countries there's no credit cards involved.
@rygorous The problem is just that payment processors are under no obligation to support this, so some do and some don't.
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@rygorous And if you have enough tax regimes that don't require payment processors to support them, it becomes an O(nm) problem. -
@rygorous Tackling at the payment processor makes it O(n), assuming a small number of total payment processors relative to merchants :) - Show replies
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