How to prevent the plugin from saving payment method?

I have tried your braintree gateway and its great!

The only problem that I have with it is that it saves the client payment method in the vault of Braintree, causing concers from clients that I might be saving their payment data which is something I dont want to deal with or have to worry about.

How can I prevent the plugin from saving the payment method?

I have seen other plugins that have an option to disable tokenization, which prevents the payment method from being saved.
How can this be done on your plugin?

Thank you for your excellent plugin.
.BR