Overview
Card-linking trouble usually comes from security requirements, issuer restrictions, or incorrect information. Kashu uses industry-standard encryption and card-network integrations, so a failure is typically the issuer declining the authorization. Kashu cannot override issuer restrictions.
Step-by-step
Check card details. Card number, expiration, CVV, and billing address, exactly as shown on your statement.
Confirm eligibility. Kashu supports most U.S.-issued Visa, Mastercard, Discover, and American Express cards. Prepaid, gift, and international cards may not be eligible.
Check with your bank. Call the number on the back of your card to confirm.
Try again. Reattempt in Cards → Add Card.
Contact support if it persists.
Need help?
Email [email protected] with the last 4 digits of the card, the error message, and your registered email. See also your issuer's guide below.