Why is there a $1 charge on my credit card/bank statement?

This happens when the payment processor we use, Stripe, verifies the credit card details you provided on Grabr.

First, Stripe will attempt a $0 authorization to verify your credit card details (except AMEX, which does not support the $0 authorization). If the $0 verification check does not work, Stripe will then attempt a $1 temporary authorization.

Please note that this is only a temporary authorization charge. Your card issuer will remove it from your credit statement, usually within a few days.