> ## Documentation Index
> Fetch the complete documentation index at: https://www.marqeta.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Update program gateway source custom headers

> Adds or updates custom HTTP headers for a specific program gateway funding source.

PUT/fundingsources/programgateway/customheaders/\{token}

Adds or updates custom HTTP headers for a specific program gateway funding source.

## URL path parameters

| Fields | Description |
| - | - |
| token string  Required | Unique identifier of the program gateway funding source. **Allowable Values:**  Existing program gateway funding source token |

## Request body

| Fields | Description |
| - | - |
| custom\_header object  Optional | Additional custom information included in the HTTP header. For example, this might contain security information, along with Basic Authentication, when making a JIT Funding request. Custom headers also appear in the associated webhook's notifications. **Allowable Values:**  Up to three name-value pairs: 500 char max per name, 500 char max per value |

## Sample request body

```json JSON lines wrap theme={null}
{
  "custom_header": {
    "my_header_name_1": "my_value_1",
    "my_header_name_2": "my_value_2",
    "my_header_name_3": "my_value_3"
  }
}
```

## Response body

| Fields | Description |
| - | - |
| account string  Returned | Bank account number. **Allowable Values:**  36 char max |
| active boolean  Conditionally returned | Indicates whether the program gateway funding source is active. This field is returned if it exists in the resource. **Allowable Values:**  `true`, `false` |
| basic\_auth\_password string  Returned | Password for authenticating your environment. **Allowable Values:**  Existing `basic_auth` password |
| basic\_auth\_username string  Returned | Username for authenticating your environment. **Allowable Values:**  Existing `basic_auth` username |
| created\_time datetime  Returned | Date and time when the resource was created, in UTC. **Allowable Values:**  datetime **Format:** yyyy-MM-ddThh:mm:ssZ |
| custom\_header object  Returned | Additional custom information included in the HTTP header. **Allowable Values:**  Up to three name-value pairs: 500 char max per name, 500 char max per value |
| last\_modified\_time datetime  Returned | Date and time when the resource was last modified, in UTC. **Allowable Values:**  datetime **Format:** yyyy-MM-ddThh:mm:ssZ |
| name string  Returned | Name of the program gateway funding source. **Allowable Values:**  1–50 chars |
| timeout\_millis integer  Returned | Total timeout in milliseconds for gateway processing. **Allowable Values:**  1000-3000 |
| token string  Returned | Unique identifier of the program gateway funding source. **Allowable Values:**  1–36 chars |
| url string  Returned | URL of the gateway endpoint hosted in your environment, to which `POST` requests are submitted by the Marqeta platform. **Allowable Values:**  Existing URL |
| use\_mtls boolean  Returned | Specifies whether or not to use mutual transport layer security (mTLS) authentication for the funding request. mTLS authentication is in the beta testing phase, and is not yet generally available. Contact your Marqeta representative for more information about using mTLS authentication. **Allowable Values:**  `true`, `false` |
| version string  Returned | Program gateway funding source object version. **Allowable Values:**  255 char max |

## Sample response body

```json JSON lines wrap theme={null}
{
  "name": "my_pgfs_name",
  "active": true,
  "token": "my_pgfs_token",
  "account": "12.003.001.000155",
  "url": "https://my_secure_domain.com/my_gateway",
  "created_time": "2023-02-28T20:00:00Z",
  "last_modified_time": "2023-02-28T20:00:00Z",
  "basic_auth_username": "my_username",
  "basic_auth_password": "my_20-to-100-character_password",
  "use_mtls": false,
  "timeout_millis": 3000,
  "custom_header": {
    "my_header_name_1": "my_value_1",
    "my_header_name_2": "my_value_2",
    "my_header_name_3": "my_value_3"
  },
  "version": "2"
}
```


## Related topics

- [Program Gateway Funding Sources Overview](https://www.marqeta.com/docs/core-api/program-gateway-funding-sources.md)
- [Update program gateway source](https://www.marqeta.com/docs/core-api/program-gateway-funding-sources/update-program-gateway-source.md)
- [Update Program Gateway](https://www.marqeta.com/docs/core-api/credit-program-gateways/update-program-gateway.md)
- [Create program gateway source](https://www.marqeta.com/docs/core-api/program-gateway-funding-sources/create-program-gateway-source.md)
- [Retrieve program gateway source](https://www.marqeta.com/docs/core-api/program-gateway-funding-sources/retrieve-program-gateway-source.md)