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

# Client ID Not Matched

## Overview

**403 - Forbidden**: This error occurs when the client ID provided does not match the specified entity integration. It usually results from incorrect credentials or missing fields in the request payload.

```json theme={null}
{
    "success": false,
    "message": "Client id not matched."
}
```

## Common Causes and How to Resolve

1. **Missing Client ID Field**:
   This error could occur due to either missing the `client_id` field in the request payload.

   **How To Resolve**: Ensure the `client_id` field is included in the payload for the specfic api endpoint. You can find the api request specifications under our [API reference page](/a\[pi-reference/introduction_v3]).

2. **Incorrect Client ID and Integration Name Pair**:
   Providing a client id that is not related to the specified integration name (`sender` field) may cause this error. The api credentials for the integration need to be consistent in the request.

   **How To Resolve**: Confirm the client id listed in the integration under the [Payment Portal](https://payments.niobi.co). You can navigate to the Integration > API Keys and select the integration. Ensure the provided client ID belongs to the integration specified in the payload.

   <img src="https://mintcdn.com/niobi/AMhGjRoBC7yfXgRW/images/apikey.png?fit=max&auto=format&n=AMhGjRoBC7yfXgRW&q=85&s=6f777351f347c63774c8ba386582965c" alt="api key navigation" width="1366" height="841" data-path="images/apikey.png" />

   <img src="https://mintcdn.com/niobi/AMhGjRoBC7yfXgRW/images/apikeys.png?fit=max&auto=format&n=AMhGjRoBC7yfXgRW&q=85&s=205be7264e5586c9b3852bba305472b3" alt="api keys list" width="1920" height="877" data-path="images/apikeys.png" />

   <img src="https://mintcdn.com/niobi/AMhGjRoBC7yfXgRW/images/clientid.png?fit=max&auto=format&n=AMhGjRoBC7yfXgRW&q=85&s=92c65b86cb16555452666222ba47d77a" alt="client id" width="1918" height="882" data-path="images/clientid.png" />

3. **Misspelled Client ID**:
   The error could also occur if the `client_id` field in the payload does not match the client id that was provided in the system.  A misspelled client id can result in the client ID not being recognized.

   **How To Resolve**: Confirm the client id for the specified integration from the [Payment Portal](https://payments.niobi.co) and ensure the last few characters match. You can access it under Integration > API Keys under the integration name.

***

## Best Practices

* **Validate All Required Fields**:
  * Always include `client_id` and `sender` fields in the payload.
* **Double-Check Configuration**:
  * Verify the client ID and integration name are correctly configured in the system.
* **Save Your Credentials Safely**:
  * While generating api credentials, ensure you save your client id and secret key in a safe place so you can easily access it later to verify it as it is masked afterwards.

***

If the issue persists, please contact our team at [support@niobi.co](mailto:support@niobi.co).

***

## Additional Resources

* [Payment Portal](https://payments.niobi.co/login)
* [API Reference Page](/api-reference/introduction_v3)