Minecraft server plugin (compatible with website) - ONLINE SHOP - INSTANT

I run a minecraft server and am searching for anyone that can build be a java plugin for my website. When someone buys a product It automatically forcs the console to run this command ---> /pex group add user is the persons in-game tag and whatever is the group. I also want each purchase to keep them as that rank for 45 days. So it has to be a timed task. After the 45 days it will derank them from that group with /pex user group remove whatever. ALSO there is a plugin like this out there known as buycraft but it only allows 3 packages and is not as user friendly with the advertisements. FOR MORE INFO MAIL ME