# gateway.technical.invalid_transaction

> For the complete machine-readable documentation index, see [llms.txt](https://apidocs.chargebee.com/llms.txt).


**gateway**

The transaction is invalid. This happens when the transaction type is not supported, the card issuer is unavailable, the card has restrictions, or there are issues with the transaction parameters.

## Recommended Customer Message

There may be an issue with your card or a temporary problem at your card-issuing bank. Please try the transaction again. If the decline persists, please use a different card or payment method.

## Root Cause[](#root-cause)

-   **Invalid or unsupported transaction type:** The transaction attempted is not supported by the payment gateway or the card network.
-   **Card issuer temporarily unavailable:** The bank's systems may be experiencing downtime or unable to authorize the transaction at the moment.
-   **Card issues or restrictions:** The customer's card may be blocked, expired, or not authorized for the attempted transaction type (e.g., international transactions).

## Troubleshooting and Solutions[](#troubleshooting-and-solutions)

-   Advise the customer to contact their bank for clarification and to ensure their card is properly configured for the type of purchase.
-   Suggest using an alternative payment method if the issue persists.
-   Ensure that all required transaction parameters are correctly provided in the API or payment request.
-   If the problem continues, contact the payment gateway support team to investigate any potential configuration or compatibility issues.