Charge Rabbit supports payment through the Stripe payment gateway.
In order to use Charge Rabbit you will need a Stripe account to connect to your Charge Rabbit account to handle payment processing and subscription management.
You can use whatever gateway you like in your normal Shopify checkout. Charge Rabbit only requires that you connect your Charge Rabbit account to a Stripe account for subscription payments. All other Shopify checkouts are unaffected by Charge Rabbit and can use any gateway of your choice.