Checkout.com saysSoft decline
201543DS authentication required
What it means
Authentication required
The issuer will only approve this payment after 3-D Secure authentication.
What to do
Send the payment again with 3DS. In regulated markets, make sure exemptions fall back to a challenge.
Worth retryingWho can fix it: You, the merchant
Yuno response codeTHREE_D_SECURE_REQUIRED
Other Checkout.com codes with the same meaning
Reference only. Codes and descriptions come from each provider's public documentation. The Yuno response code is a reference mapping and does not guarantee how a specific transaction is processed.