Most readers have companies that support them . . . I was wondering if it's possible to build a web app, through the online store, to utilize the plug in credit card readers for your phone??
Web apps are not eCommerce and have no public access (outside) API so ignore those.
You can create 3rd party solutions that read that data and send it to BC via the API and you can source build that if you need to.
There is nothing in BC directly for what your asking for.
Retrieving data ...