When a new credit card is added or updated on an account, our payment processor performs a validation check.
That can look like a $/€/£1 debit and credit transaction on some statements, even though no money is billed.
The authorization is processed outside our system at the payment gateway and is usually removed from the credit card statement within a few minutes. Consequently we don't include the authorization on our invoice documentation and don't have anything on file that we can provide as a receipt.
If you have any other questions, just let us know.