My credit card was charged without an invoice. Why?
Generally, if there is a charge on your card and the invoice is not generated, it should be a Payment Method Authorization which occurs when you launch a new campaign or increase the budget of an existing campaign.
The amount will be the sum of the weekly budgets for the active and paused campaigns. This is not an actual charge and is reversed immediately. It is to check if the payment method is active and has sufficient funds to pay the upcoming invoices.
To learn more, check out Payment Method Authorization.