On some payment methods, we ask the depositing user to cover a processing fee for the payment. These fees differ for different payment methods, and you can view a list of all the specific fees for your location here.

If you select a payment processor which offers multiple different payment methods, the processing fee will show up as 'Varies'

This is because each payment method via that payment processor will carry a different fee. You can use the link above to view all the specific fees for payment methods via your chosen method.