The article outlines that API IS NOT JSON over HTTP, albeit it's the most popular case. You can send a text file/binary (that contains X12, EDIFACT) to an API as easily as JSON. In fact, that's what EdiNation does; it allows you to send EDI files to a web API. So it shouldn't matter if you deal with EDI or JSON, just convert one to the other, and off you go. Another way to do what everybody else is doing anyway.