| A0001 | Invalid API secret key | 401 |
| A0002 | Invalid signature | 401 |
| A0003 | Parameter validation failed | 400 |
| A0004 | Permission denied | 401 |
| A0005 | Merchant limit exceeded | 400 |
| A0006 | Abnormal merchant status | 400 |
| A0007 | Unsupported transaction currency | 400 |
| A0008 | Transaction limit exceeded / payment amount must be within the allowed range | 400 |
| A0009 | Order does not exist | 400 |
| A0010 | Merchant contract does not allow this operation | 400 |
| A0011 | Idempotency parameter mismatch error | 400 |
| A0012 | Insufficient merchant account balance | 400 |
| A0013 | Payment has succeeded; the order cannot be canceled | 400 |
| A0014 | Refund not allowed due to refund rules | 400 |
| A0015 | Payment channel not supported; the order cannot be canceled | 400 |
| A0016 | Payment channel rejected; the order cannot be canceled | 400 |
| A0017 | Payment channel not supported; the order cannot be refunded | 400 |
| A0018 | The user has no available payment method | 400 |
| A0019 | Refund not allowed due to a chargeback dispute | 400 |
| A0020 | Payment amount exceeds the transaction limit | 400 |
| A0021 | Cumulative payment amount exceeds the daily transaction limit | 400 |
| A0022 | Multiple products detected; the merchant must specify the product name | 400 |
| A0023 | Token has expired; the order cannot be created | 400 |
| A0024 | Exchange rate has expired; the order cannot be processed | 400 |
| A0025 | Period number must be greater than one | 400 |
| A0026 | The checkout page language specified by the merchant is not supported | 400 |
| A0027 | The number of refunds has exceeded the maximum of 50 | 400 |
| A0028 | The subscription is still in progress or has failed, so the management URL is unavailable | 400 |
| A0029 | Invalid card data provided by the merchant | 400 |
| A0030 | Unable to find the card BIN provided by the merchant | 400 |
| A0031 | The card scheme or card type provided by the merchant is not supported | 400 |
| A0032 | Invalid payment token data provided by the merchant | 400 |
| A0033 | Multiple payment methods detected; the merchant must specify the payment method country | 400 |
| A0034 | The order expiry time provided by the merchant has expired | 400 |
| A0035 | The current order does not support capture | 400 |
| A0036 | The current order status does not allow capture | 400 |
| A0037 | The user payment token is invalid or has expired | 400 |
| A0039 | The order has already been refunded by the chargeback alert service | 400 |
| A0040 | The order cannot be created concurrently | 400 |
| A0041 | Chargeback does not exist | 400 |
| A0042 | Chargeback status is already final | 400 |
| A0043 | The current status does not allow evidence submission | 400 |
| A0044 | File does not exist | 400 |
| A0045 | The MIT transaction cannot be processed because the tokenId status is unverified | 400 |
| A0046 | Access denied: the request IP is not in the whitelist | 401 |
| A0047 | The checkout page language format is invalid. It must follow IETF BCP 47: a two-letter ISO 639-1 language code, an optional four-letter ISO 15924 script code, and an optional two-letter ISO 3166-1 alpha-2 region code | 400 |
| A0048 | The previous plan change is still in payment. Wait for the payment process to finish before switching plans | 400 |
| A0049 | The previous plan change is being cancelled. Retry later | 400 |
| A0050 | The previous plan change has been paid successfully. Start a new change from the latest active plan | 400 |
| A0051 | The declared tax amount does not match the tax calculated for this order | 400 |
| A0052 | No available payment method supports the declared tax for this order | 400 |
| A0053 | Missing billing information required to validate the declared tax amount | 400 |
| A0054 | Another plan change request for this subscription is being processed. Retry later | 400 |
| A0055 | The subscription is being modified. Retry later | 400 |
| A0056 | cancelAt must be later than now and no later than the subscription end time | 400 |
| A0058 | The subscription has a scheduled cancellation. Resume it before changing the plan or amount | 400 |
| A0059 | The subscription has a scheduled cancellation. Resume it before cancelling immediately | 400 |
| A0060 | The scheduled cancellation has reached its effective time and can no longer be rescheduled | 400 |
| A0061 | Merchant is not allowed to initiate MIT | 400 |
| A0062 | This subscription does not support scheduled cancellation | 400 |
| A0063 | Payment session is invalid or has expired, please create a new session. | 400 |
| A0064 | This payment request id already has an order, use a new one to create a session. | 400 |
| A0065 | The confirm token is no longer valid, please reload the payment session and try again. | 400 |
| A0066 | This payment session has already been submitted, please create a new session. | 400 |
| A0067 | Some required fields are missing, please complete them and try again. | 400 |
| A0068 | Card data and wallet payment token must not be sent when creating a payment session; the Element SDK submits them at confirm. | 400 |
| A0069 | Pre-payment validation is not supported for this pay method. | 400 |
| A0070 | The price of this payment session has changed, please refresh the session and try again. | 400 |
| A0071 | The agent payment credential is invalid or does not match the order. Do not retry with the same credential. | 400 |
| A0072 | The agent payment credential has expired. Request a new payment challenge and retry. | 400 |
| A0073 | The previous repayment for this period is still in payment. Wait for the payment process to end before starting a new one. | 400 |
| A0074 | The previous repayment for this period is being cancelled. Retry later. | 400 |
| A0075 | The previous repayment for this period has been paid successfully. This period no longer needs to be repaid. | 400 |
| A0076 | The previous seat add-on has been paid successfully, please initiate a new one based on the latest subscription amount. | 400 |
| A0077 | The previous seat add-on is still in payment, please wait for the payment process to end before initiating a new one. | 400 |
| A0078 | The previous seat add-on is being cancelled, please retry later. | 400 |
| A0079 | This payment session has no card pay method, so a card tokenization session is not available. | 400 |
| A0080 | No payment channel supports MIT for this payment method | 400 |
