# Add or Update Custom Data
source: https://developer.mastercard.com/mastercard-processing-core/documentation/sandbox-testing/data-management/add-update-custom-data/index.md

## Test case -- Success -- Add Custom Data for a Client {#test-case--success--add-custom-data-for-a-client}

This test case describes adding custom data for a specified client in the CMS.

**Sample request**

`POST /clients/40000/custom-data`

```JSON
[
  {
    "tagContainer": "ADD_INFO_01",
    "tagName": "TAG_01",
    "tagValue": "TAG_01_VALUE",
  }
]
```

**Sample response**

`200`

## Test case -- Success -- Remove Custom Data for a Client {#test-case--success--remove-custom-data-for-a-client}

This test case describes adding custom data for a specified client in the CMS.

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

|    Field    | Available value |
|-------------|-----------------|
| `removeTag` | true            |

**Sample request**

`POST /clients/40000/custom-data`

```JSON
[
  {
    "removeTag": true,
    "tagContainer": "ADD_INFO_01",
    "tagName": "TAG_01"
  }
]
```

**Sample response**

`200`

## Test case -- Success -- Add Custom Data for a Contract {#test-case--success--add-custom-data-for-a-contract}

This test case describes adding custom data for a specified contract (account contract or card contract) in the CMS.

**Sample request**

`POST /contracts/70001/custom-data`

```JSON
[
  {
    "tagContainer": "ADD_INFO_01",
    "tagName": "TAG_01",
    "tagValue": "TAG_01_VALUE",
  }
]
```

**Sample response**

`200`

## Test case -- Success -- Remove Custom Data for a Contract {#test-case--success--remove-custom-data-for-a-contract}

This test case describes adding custom data for a specified contract (account contract or card contract) in the CMS.

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

|    Field    | Available value |
|-------------|-----------------|
| `removeTag` | true            |

**Sample request**

`POST /contracts/70001/custom-data`

```JSON
[
  {
    "removeTag": true,
    "tagContainer": "ADD_INFO_01",
    "tagName": "TAG_01"
  }
]
```

**Sample response**

`200`