While buying on Iconfinder or being charged for the renewal of your Pro subscription, some payments may be unsuccessful. If this happens, Iconfinder will return an error code that informs you what the problem with your credit card might be. Please visit the article on Reasons why credit card payments fail for more information. 

For subscriptions, Iconfinder will retry the charge a few times during 30 days. If we don't succeed at renewing your subscription, it will become paused. Read more about Paused subscription and about our Policy for unpaid subscription periods. 

The card that you were trying to pay with is expired. 

Solution: Retry the payment with another card by adding it to your Payment settings. Contact customer support if you want to use another payment method.