It's a clickbait ad for something called "Nerve".

The original idea for "electronic data interchange"[1] was to have a standard format for inter-company invoices, purchase orders, bills of lading, customs clearance, etc. So you only need N implementations, not N^2. This got going in the 1970s. So the formats are ancient. This is a flight ticket availability request in the international EDIFACT format.

    UNA:+.? '
    UNB+IATB:1+6XPPC:ZZ+LHPPC:ZZ+940101:0950+1'
    UNH+1+PAORES:93:1:IA'
    MSG+1:45'
    IFT+3+XYZCOMPANY AVAILABILITY'
    ERC+A7V:1:AMD'
    IFT+3+NO MORE FLIGHTS'
    ODI'
    TVL+240493:1000::1220+FRA+JFK+DL+400+C'
    PDI++C:3+Y::3+F::1'
    APD+74C:0:::6++++++6X'
    TVL+240493:1740::2030+JFK+MIA+DL+081+C'
    PDI++C:4'
    APD+EM2:0:1630::6+++++++DA'
    UNT+13+1'
    UNZ+1+1'

This dates from when data communications were really expensive per byte. It's also from when people were thinking in terms of forms expressed in machine-readable data, not an API which actually did something. There are about five different standards bodies for this sort of thing. There's a mini-industry which converts this sort of thing to and from other formats.

Anyone involved in modern systems for this sort of thing?

[1] https://en.wikipedia.org/wiki/Electronic_data_interchange