# Update Card Contract Data
source: https://developer.mastercard.com/mastercard-processing-core/documentation/sandbox-testing/data-management/update-card-contract-data/index.md

## Test case -- Success {#test-case--success}

This test case describes updating data for a specified card contract in the CMS.

Note: The field that you do not want to change must not be in the request. The field sent in the request with a null value explicitly will be cleared in the CMS. **Sample request**

<br />

`PATCH /cards/70001/ -H 'If-Match: "7fedf39c3c2952a62821de4b480d1d6f"'`

```JSON
{
  "cbsNumber": " CBS83863371812033",
  "cardContractName": "Card contract name"
}
```

**Sample response**

`204`  

`ETag: "7fedf39c3c2952a62821de4b480d1d6f"`

## Test case -- Fail -- Duplicated cbsNumber {#test-case--fail--duplicated-cbsnumber}

This test case describes an attempt to update the data for a specified card contract with the `cbsNumber`, which already exists in the CMS.

For this test case, use the following information in the request:

|    Field    |   Available value   |
|-------------|---------------------|
| `cbsNumber` | CBS1950395609519670 |

**Sample request**

`PATCH /cards/10102 -H 'If-Match: "5c7d022061b0874200bfed735c6b9308"'`

```JSON
{
  "cbsNumber": "CBS1950395609519670",
  "cardContractName": "Card contract name"
}
```

**Sample response**

`400`

```JSON
{
    "Errors": {
        "Error": [
            {
                "Source": "MASTERCARD PROCESSING",
                "ReasonCode": "DUPLICATED_CBS_NUMBER",
                "Description": "Duplicated CBS number.",
                "Recoverable": false
            }
        ]
    }
}
```