# gateway.payment_method.card_incorrect_number

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


**gateway**

The card number entered is incorrect. This can happen when the customer mistyped the card number, the format is invalid, a test or dummy number was used, or the card is no longer active.

## Recommended Customer Message

The card number you entered is incorrect. Try again with the correct card number.

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

-   **Typographical errors:** The customer mistyped the card number.
-   **Invalid card format:** The number does not conform to known BIN patterns or is too short/long.
-   **Test or dummy numbers:** Placeholder or mock card numbers were used in a live transaction environment.
-   **Expired or deactivated card:** In rare cases, cards no longer active may return as invalid.

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

-   Inform the customer that the card number they entered is incorrect.
-   Ask the customer to double-check the number on their card and re-enter it carefully.
-   Ask the customer to use a different card if the issue persists.
-   Use account updater wherever applicable to automatically update the card number and avoid card expired failures.