| Loading POS configuration data failed. Missing parameter file | The credential parameters are incorrectly configured. | Please contact Support. |
| Loading POS Configuration data failed. Check missing parameters. | The POSConfigurationServiceHost or POSConfigurationServiceTimeout values are missing. | Please contact Support. |
| Loading POS configuration data failed. Check param config. | The device has lost internet connectivity. | Ensure a strong Wi-Fi or mobile network connection is available. |
| Error trying to deserialise json. | A general validation error has occurred. The Unity Gateway rejected the request due to invalid or missing data. | Please contact Support and quote the displayed error message. |
| EMV configuration file downloaded error. | The EMV configuration file URL is invalid or missing. | Please contact Support. |
| Customer card has expired. | You're attempting a transaction with an expired card. | Ask the customer to retry using a valid card. |
| Unexpected error. | An unexpected issue occurred. | Please contact Support. |
| Try another card. | An invalid or unsupported contactless card was used. | Insert the card using the chip reader (ICC slot) and retry. |
| Incorrect PIN. Please try again. | The entered PIN is incorrect. | Ask the cardholder to re-enter their PIN. |
| Unable to print receipt. Refill paper and press enter. | There is no paper in the printer. | Refill paper and press Retry to continue printing. |
| Reswipe card. | The card wasn't read correctly. | Retry the swipe or use a different card or payment method. |
| You have exceeded the PIN input limit. Your account has been blocked. | The cardholder has exceeded the maximum number of PIN attempts. | The cardholder must contact their card issuer to unlock the card. |
| No result in Transaction history. | There are no recorded transactions or the Reporting Service URL is missing/invalid. | Please contact Support if the issue persists. |
| Merchant block error. Transaction amount greater than ceiling limit amount. | The transaction amount exceeds the allowed ceiling limit configured for the terminal. | Try entering a lower amount or contact your system administrator. |
| Format error. | An incorrect CVV code was entered during a keyed transaction. | Retry the transaction and ensure the correct CVV is provided. |