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# onAuthorizationFailure()

    function onAuthorizationFailure(callback: FailureCallback): void;

Registers a callback to handle authorization failures (401 errors). The callback should refresh the authentication token and return the new authorization header. The SDK will automatically retry the failed request with the new token.

## Parameters​

### callback​

`FailureCallback`

Async function that refreshes token and returns new authorization header

## Returns​

`void`

## Example​

    onAuthorizationFailure(async (error) => {
      const newToken = await refreshAuthToken();
      sessionStorage.setItem('Authorization', newToken);
      return newToken;
    });