Most double charges are temporary pending holds, not final posted charges, so you won't be billed twice.
How the hold works
When a merchant checks your card, a temporary hold shows up first, followed by the actual final charge. That hold typically drops off your statement within two to five business days and does not charge you twice.
If both charges post
If two identical charges both post to your statement, contact our support team and we can help dispute the extra charge right away.