Write a java/c/c++ code that buys a specific roblox item when under a specific amount of robux

I’m interested in the roblox limited catalog and I’m wanting to make a program that I can sell to others for robux. I already have an auto refresher for chrome and an item relister so now i just need a program that I can run 24/7 where I can give it a link to an item and when the item is on sale below a set amount and my account has enough robux, it will buy the item. I don’t have much experience in coding so my only requirements are that it’s fast, reliable and I’m able to run multiple of the program at once. Thank you!!