> ## Documentation Index
> Fetch the complete documentation index at: https://legitimuz.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# Options
> See how to further customize the SDK
This is the address of the Legitimuz API.
Example: `https://api.legitimuz.com`
This is the address of Legitimuz Verify.
Example: `https://liveness.legitimuz.com`
The token is your integration token. You can generate an integration token on the
[integrations](https://dashboard.legitimuz.com/dashboard/integrations) page under the `installation` tab in the Legitimuz Dashboard.
The `lang` option sets the language that will be used in the [Face Index](./introduction) flow.
The success callback is triggered when `success` occurs at any stage of the [Face Index](./introduction) flow.
A [string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) with the stage where success occurred is passed as a parameter.
Examples:
```html theme={null}
```
```jsx theme={null}
import { useRef } from 'react';
function Component() {
const sdkInstance = useRef(null);
const handleOnLoadSDK = () => {
sdkInstance.current = LegitimuzFaceIndex({
/* options */
onSuccess(eventName) {
console.log(eventName); // faceindex
},
});
sdkInstance.current.mount();
}
return (
<>
);
}
```
The error callback is triggered when an `error` occurs at any stage of the [Face Index](./introduction) flow.
A [string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) with the stage where the error occurred is passed as a parameter.
Examples:
```html theme={null}
```
```jsx theme={null}
import { useRef } from 'react';
function Component() {
const sdkInstance = useRef(null);
const handleOnLoadSDK = () => {
sdkInstance.current = LegitimuzFaceIndex({
/* options */
onError(eventName) {
console.log(eventName); // faceindex
},
});
sdkInstance.current.mount();
}
return (
<>
);
}
```