Credit Card Trouble

I am having trouble with my credit card information for my online order.
If you receive an error message related to credit card authorization failure, double check that the billing address on the credit card and matches your account billing address, try re-entering your CVN or security code, and be sure that the card is current and valid. After validating the information you’ve entered and an error message is received a second attempt, call 1-877-koganshop or contact your financial institution for further assistance.