/biz/ - Business & Finance

I can explain those "payment slates" with scary-looking pi.
Imagine you want to sell bread for wine, but you want to hide the fact it's about bread and wine.
You agree with the other party to replace bread with 'X' and wine with 'Y' in the contract. You both sign the note stating the replacement elsewhere, to be used in case of attempted fraud.
This is literally it, the idea that's described (among others) on the screenshoted part.

Whoever wrote this is intentionally making fun of the dumb reader.