For important notices, I think it's important to just communicate that message directly to every visitor, without relying on them to navigate to a specific section of the site.
It's just frustrating to hit a false constraint like this. There is enough "room" on page to display an extremely long message, since it's a pop-up and doesn't have to fit into existing structure. The pop-up window already has the ability to auto-resize, it just doesn't work correctly. Sometimes making the font smaller ends up fitting less visible text, because it causes the window to resize smaller.
This is just bad coding and could be easily resolved if Square support would acknowledge the bug and send to their software team. the support staff instead act like a wall between customers and the software team.
