Why did Beeminder charge my card?
On your Payments page, you can see all the past charges we've made, from all sources: derailments, subscriptions, GTBee, IFTTT charge action, and the charge endpoint of the Beeminder API.
Each charge is either paid, failed, settled (PayPal only), or refunded. One failed charge may be listed multiple times — once it's failed, it will never update to paid; a new charge with the same information is created & tried.
Note that derailment charges are usually listed for one day after you actually derailed on the goal, due to the 24-hour legitimacy check waiting period between the derailment happening & the charge being processed.
You should be able to cross-check any charges on your card with our list to see exactly what triggered the charge. If anything seems off, please contact support and we can investigate!