It is absolutely free. We does not set minimum limits on the withdrawal of funds earned.
You will receive an email alert about the completed sale. You can also control receipts in your account on PopKit.
We pays the earned money every 31 days. Then you can withdraw them to your PayPal account.
Yes, you can participate in our affiliate program if you do not live in the US. The main condition is that Paypal works in your country.