Our website is using https protocol, which means it's encrypted and no one can see or read the details being sent. You can verify that we do use https / ssl encryption by looking at how our address starts (it starts with https) & by the sign of the padlock before the address. You can also click on the padlock in the browser to see the details of our ssl certificate, which is provided by a certified external agency.
We do not store any credit card details, our app doesn't even see it - we're sending it directly to the payment provider, which in our case is Stripe, who processes the payment. All we know from stripe is that the payment was successful & we can go ahead and prolong the subscription.