If you are not satisfied with OysterVPN speed, features, security, or anything else, then you can contact OysterVPN support center via live chat or email and ask for a refund. The only thing to keep in mind is that you can claim a refund within the first (30-Days) of your subscription. Your subscription fee will be refunded without any questions into the account you have added as your payment method.
Currently, OysterVPN not offering a free trial.