The WP Voting Contest (Buy Votes) Extension requires the WP-Voting-Contest 3.6.3+ Plugin in order to work.
The WP Voting Contest (Buy Votes) extension allows you to charge for votes. The voting fee can be set at the category level so that you can charge a different voting fee for each contest when running multiple contests. You can chose to use PayPal and/or Stripe for buy votes payment options.
Here is the Popup that the user will get when they vote if you enable both PayPal and Stripe:
You can enable the Buy Votes Settings on a per category bases. That means you can run free to vote contests and paid voting contests at the same time.
Here are the global settings to connect with PayPal or Stripe:
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In your Contest Category settings you can choose if you wish to enable the Buy Votes option, set the cost, and choose if you want to use PayPal and/or Stripe.
You can set how many votes a voter gets for their purchase on a per contest basis.
If PayPal or Stripe supports your currency then it will be available as a currency option.