# gateway.technical.issuer_not_found

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


**gateway**

The card issuer could not be found. This happens when the card number is invalid or unrecognized, the BIN (Bank Identification Number) does not correspond to a valid issuing bank, there is a connectivity issue with the issuer, or the card belongs to a discontinued card program.

## Recommended Customer Message

The card number you entered appears to be invalid or there was an issue connecting with your bank. Please double-check your card details or contact your bank for assistance.

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

-   **Invalid or unrecognized card number:** The card number provided does not match any known card issuer or is improperly formatted.
-   **Incorrect BIN:** The first six digits of the card number (BIN) do not correspond to a valid issuing bank.
-   **Connectivity issue with the issuer:** The payment gateway was unable to establish a connection with the issuing bank's systems.
-   **Decommissioned or unsupported card ranges:** The card number belongs to a discontinued or unsupported card program.

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

-   Advise your customer to verify the card number and try the transaction again.
-   Recommend using a different payment card if the problem persists.
-   Instruct your customer to contact their bank for clarification on the card's validity and issuing status.