> Yea the one that comes to mind for me would be the card swiper by Square and other companies.
At the hardware level, that's a microphone. I don't see any a priori reason to imagine it would fail to work via the Lightning to 3.5mm adapter, any more than any other microphone would. It's less convenient mechanically because the connection is no longer rigid, which may make swiping uncomfortable, but that's the only drawback I see.
(And a sibling comment mentions having seen Apple explicitly call that out as something which will keep working, so maybe we don't need to reason a priori here.)
At the hardware level, that's a microphone. I don't see any a priori reason to imagine it would fail to work via the Lightning to 3.5mm adapter, any more than any other microphone would. It's less convenient mechanically because the connection is no longer rigid, which may make swiping uncomfortable, but that's the only drawback I see.
(And a sibling comment mentions having seen Apple explicitly call that out as something which will keep working, so maybe we don't need to reason a priori here.)