Just to clarify, the problem was invalid json from the beginning causing a 400 bad request, causing $urlget to not fill the binvar and see the request as a failure ($urlget().state is fail, which might be the only thing missing from your script if anything), the $urlget script was correct and nothing needed to be "fixed" there as OP said.
Worth mentioning that OP does not know mirc scripting at all and the original script was written by chatgpt, which, while the script had many wrong part, had the connecting/http part working.
