Yes! On the $0/mo plan, first off there are no recurring charges for it. And if you process test orders using the Shopify payments test mode, then you will not be charged the $1. And worse case if you do process a real payment, refund it and you will be refunded the $1 automatically.
New accounts also receive 5 free credits to use for free orders
The paid monthly plans all offer a 3 day free trial. Simply delete the app from your store or downgrade to the free Standard plan to cancel the trial.