Hmmm... It seems that there is a communications format called EDI (Electronic Data Interchange) used for tons of different industries. Purchase Order Example: https://www.1edisource.com/resources/edi-transactions-sets/edi-850/

Seems pretty straightforward except that each line has a specific prefix defining the content of the line.

I'm going to need to use it to grab and send orders back and forth to Wayfair. Does anyone out there have experience in EDI data exchange to maybe give me a hand?

Looks like a government banking committee came up with it.