Our payment processor is Stripe and we are not saving any credit card numbers or details in our database. You enter your details into a form, it is sent to Stripe securely and they take care of the rest. All that's saved is the amount you paid, the package you bought and the details attached to your forum account. Such as the email address. That's it.
We are not asking for any private details nor do we store them. Never have in the past years, never will. Same goes for your credit card details.
We have been around for over 10 years, never has anybody complained about our donation method being unsafe.