| 4000 | Failure | Invalid data. Missed required input fields | Ensure that all the mandatory parameters for the request are provided and contain valid values. |
| 4001 | Failure | Payment card expired | Inform the payer that their card is expired and request an updated card with a valid expiration date. |
| 4005 | Failure | Internal error | Contact our support team to resolve any system configuration issues before attempting the transaction again. |
| 4009 | Failure | Insufficient funds | Notify the payer that there are insufficient funds in their account. Recommend they either top up their account or use a different card. |
| 4010 | Failure | Transaction limit exceeded. Try another card. | Advise the payer to either use a different card or contact their bank to adjust their transaction limit. |
| 4012 | Failure | Transaction amount limit exceeded. Try another card. | Inform the payer that the transaction amount exceeds their card's limit and suggest they use a different card or contact their bank to increase the card's limits. |
| 4119 | Failure | Such order_id already exists in the system. | Check for a duplicate order and ensure that the order_id is unique. Alternatively, you can generate a unique order ID using the UI solution. |
| 4124 | Failure | Invalid currency. Please use: USD, UAH, EUR. | Double-check that the correct currency (USD, UAH, or EUR) is passed in the transaction request. Update the request with one of the supported currencies before resubmitting. |
| 4128 | Failure | Currency exchange rate is not found | |
| 4139 | Failure | Invalid transaction amount | Verify the transaction amount and ensure it meets the system's limits. If necessary, request the payer to enter a valid amount within the allowed limits. |
| 4144 | Failure | Invalid card data | Ask the payer to double-check their card details (number, expiration date, and CVV) and correct any mistakes. |
| 4147 | Failure | 3-D Secure verification timeout | Inform the payer that the 3-D Secure verification has timed out. Advise them to retry and complete the process within the given timeframe, or suggest trying a different payment method. |
| 4148 | Failure | Timeout | The server did not receive a complete request message within a certain amount of time. You can retry the request. |
| 4149 | Failure | Session expired | Inform the payer that their session has expired and ask them to retry the transaction. |
| 4150 | Failure | Invalid operation | Verify the type of transaction and ensure that it is permitted. |
| 4151 | Failure | Invalid input fields | Double-check the input fields and verify the accuracy of the payer's data before resubmitting the request. |
| 4152 | Failure | Invalid configuration. Please, contact technical support. | Contact our support team to resolve any system configuration issues before attempting the transaction again. |
| 4153 | Failure | Transaction rejected | Inform the payer that the transaction was rejected. Encourage them to try a different payment method or contact their bank for more details. |
| 4154 | Failure | Transaction is rejected by anti-fraud | Notify the payer that the transaction was flagged for potential fraud. Recommend they contact their bank to verify the legitimacy of the payment or use a different payment method. |
| 4155 | Failure | Transaction was declined by blacklist | Inform the payer that their transaction has been blocked due to a blacklist. Suggest they use a different payment method or contact support to resolve the issue. |
| 4156 | Failure | Card not supported | Inform the payer that their card is not supported. Recommend they use a different card that is accepted by the system. |
| 4157 | Failure | Authorization failed. Please, contact issuer bank | Inform the payer that authorization failed. Advise the payer to either try again, use a different card, or contact their bank for assistance. |
| 4158 | Failure | Transaction rejected. Please, contact issuer bank | Notify the payer that the transaction was rejected and advise them to contact their bank to resolve the issue. |
| 4159 | Failure | Wrong OTP code. Please try again | Inform the payer that the OTP code entered is incorrect and ask them to try again. |
| 4160 | Failure | Failed to create transaction | Retry the transaction and, if the issue persists, contact our support team for assistance. Inform the payer of the retry. |
| 4161 | Failure | Transaction declined due to balance limit | Ensure that your account in our system has sufficient balance to cover the transaction. You can either top up your account or wait for it to be refilled by incoming customer transactions before retrying the payment. |
| 4200 | Failure | Invalid configuration. Please, contact technical support. | Contact our support team to resolve any system configuration issues before attempting the transaction again. |
| 4201 | Failure | Payment rejected due to a gateway issue | Payment gateway unavailable (scheduled maintenance). For timing and details, please contact our support team. |
| 6001 | Failure | The limit for the amount or number of customer payments has been exceeded. Amount or transaction limit has been exceeded. | Inform the payer that the transaction amount or number exceeds their card's limit and suggest they use a different card. |
| 6005 | Failure | Transaction was declined by internal blacklist. | If the customer is on the blacklist, you can advise them to use a different payment method. If you think this transaction was blocked in error, please contact support for further review. |
| 6006 | Failure | Order has expired | The order has expired due to time limits. You can retry the transaction by creating a new order. Contact our support team to increase the lifespan of your orders or set a custom lifespan for each payment directly via the merchant portal. |
| 6007 | Failure | Payment has cancelled | This status means the cancellation was intentional and initiated on your side. Ensure the customer is notified promptly with clear information about the cancellation and allow them to retry if necessary. |
| 6008 | Failure | Transaction was declined because of balances limitation | Ensure that your account has sufficient balance to cover the transaction. You can either top up your account or wait for it to be refilled by incoming customer transactions before retrying the payment. |
| 6009 | Failure | Transaction is rejected due to sanctions policy violation | Request the payer to provide identity documents, including either a passport or ID card, and a tax ID number. Pass the information to our support team. |