how to use an eCurrency with wordpress

is there any wordpress plugin where people can buy tokens or any virtual currency to spend in services?

I want my users to buy tokens and then spend it on services provided in the website.

It is like the typical wordpress e-commerce when ppl can buy stuff, but instread of paying with a credit card, they will use tokens the previously bought.

is there a plugin to do that?

via Chebli Mohamed