[raiderlax]

I just wanted to ask this:

What I'm looking to do is have users earn credits by how much they post, how much they refer etc... and I know this can do that, now I want them say to be able to reach 200 credits and they get a free "cup".

Now the place where I'm confused is how they can use their credits to do this.
Say they want to use their 200 credits to get this "cup" can they use it and their 200 credits will be deducted because they used them, now do I have to manually deduct them or how does this work.

What I'm trying to accomplish is that they save up their points to say use them on getting a "cup" than once they use their credits, they go away, and than they have to earn more credits to get more stuff, does this system work like this?

If their credits can't be deducted and used on something I don't really see a point to using it for me because than I could just base getting a "prize" on post count.

Thanks in advance