Your bank may place an authorization hold on your credit card for an amount less than $1, or the equivalent amount in your currency, at the moment you update the payment information of your LinkedIn Ads account. This isn't an actual charge and you will not have to pay it.
The authorization hold will be removed from your credit card statement according to the policies of your bank. Please note that it usually takes seven business days or fewer for it to be removed. To remove an authorization at your convenience, please contact your bank.