Adding Prices to Commands?

I'm not sure how to add a price to a command.

For example:
The player can change the spawning type for free
/spawner zombie

But I want it so that when they execute the
/spawner "mob"
command that, it charges them a certain amount of money. Anyone know how to go about doing that?

 

You can add prices to commands with Essentials in the config

 

Ok, but how?

Anyone?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I don't use Essentials, but BossCooldowns works for me.

 

If you use essentials, open up the config.yml file for it.

Under the EssentialsEco section (about half way down) you will see where to do this, as well as examples of how it is done.

 

Looks nice, can you add me on skype to help me? zzmiuxpremiumzz

Won't work because i'm not using an essentials plugin for /spawner