Everyone wants to learn Rust at least a bit, right? What is then a better opportunity than when I need to periodically check a potential public IPv4 change for my Crafty server, so the domain hosted on Wedos still leads to correct IPv4. And also what better occassion than to learn about Wedos nonsense like requiring a JSON payload that is not actually a JSON...
For this script to work you need to have a precreated A DNS record and know its row_id (thus then unused commands in code).