We currently accept payments via Stripe and PayPal. Stripe has a wide range of supported Cards which doesn't depend on us. Ultimately and as exception for edge situations is possible to make a wire-transfer, in which case you must first contact us.
We don't provide discounts on renewals, but rather adjust our prices for the benefit of everyone.
Yes, we offer refunds to unsatisfied customers within the first 30 days of purchase, if mutual agreement cannot be reached. Please refer to the Terms of Service for more details.