Q. Why would a payment gateway company do a security check and decline the transaction when the issuing bank already approved the transaction?

A. To protect Casio and our valued customers, payment gateway providers implement additional security checks to prevent “possible” fraud. Your bank may verify the card number and authorise the charge amount, but our payment gateway may decline the charge based on the fraud security settings i.e.address mismatch. In this case, funds are NOT transferred from your account to Casio.