Premium Plans
One of the features Pro Polls offers is the ability to setup Premium Plans for your users. You can limit the amount of votes a user receives on their polls and then have Premium Plans, which they can purchase, to increase the amount of votes per Poll they can receive.
You can create the Premium Plans in the Admin Panel under Premium Plans option. You can set the cost of each plan and also how many votes the Plan allows the user to have on their Polls. Each Plan can have it's own Time Limit for when it expires, once it expires the user will go back to being a regular user. A plan can also have unlimited time too and never expire.
A user can top up their balance by using PayPal. We have implemented a system that will automatically credit their account once they have made a payment to you. You can set the PayPal account in the Payment Settings page in the Admin Panel.