If you are specifically looking for a POS that runs on desktop (Win and Mac OS) and can integrate with Shopify, take a look at ConnectPOS.
@sophearot TalkShopLive allows you to embed and share a shoppable live show anywhere. It remains shoppable and viewable from the playback—it's a point of sale anywhere you watch it since the buy button is attached to the show. The checkout process happens without leaving the video experience. The orders made on the video can run through your Shopify store via the app.
ConnectPOS is compatible with multiple devices, such as PC (Window and macOS) and mobile devices (iOS and Android). We're delighted to support your omnichannel journey ahead!
Some of the most outstanding features of ConnectPOS are:
Also big thanks to @Nick_Marketing for introducing us.