You can have a virtual currency in your community to use it as a reward to the best answer to a questions, best members of the month, etc. First, you need to install the virtual currency app on your community, then you can define a name and a value for the virtual currency. Follow the steps below:
Admin Panel> Apps> Install Virtual Currency App:
Once you click on the Virtual Currency app, you can define a name and real value for your currency.:
Please do not forget to Enable and Update the changes.