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I just purchased Premium through your website and I am seeing an additional $1 charge, what is this?
Our payment processors (Stripe and PayPal) will often attempt a small ($0 or $1) authorization that is immediately reversed before a payment to make sure payment will work. Depending on the bank or credit institution however, it can sometimes take several business days for the reversal to appear on a cardholder's statement.
Stripe has more information on this here: https://support.stripe.com/questions/why-does-my-customer-see-a-1-charge-when-their-payment-failed