Depending on your credit card issuer, you may see a $1 pending charge on your online statement when purchasing an Arkadium Advantage subscription.
This $1 (or equivalent in your local currency) is a temporary preauthorization, not an actual charge, and will eventually disappear from your online statement.
The speed at which this temporary preauthorization will disappear from your online statement depends upon your card issuer, but most people see it disappear within 3-5 business days, if not sooner.
NOTE: a temporary preauthorization may appear even when the order was canceled or declined