Checkout.com saysHard decline
20031Bank not supported by Switch
What it means
Issuer not recognized
The network could not identify the bank behind this card.
What to do
Ask for another card. If it affects a whole BIN range, raise it with your provider.
Don't retry as-isWho can fix it: The card issuer
Yuno response codeINVALID_ISSUER
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.