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

# init()

> Optional. Set vycheck() defaults once.

## Signature

```ts theme={null}
function init(config: InitConfig): void;
```

Optional. Anything here can be passed to [`vycheck()`](/v3/dev/spec/browser-sdk/vycheck) per call instead; use `init()` to set it once.

## Options

Presentation and callbacks: `mode`, `display`, `container`, `inlineHeight`, `theme`, `onComplete`, `onClose`. Same meaning as on [`vycheck()`](/v3/dev/spec/browser-sdk/vycheck#options).

Deprecated and still accepted: `publishableKey`, `email`, `phone`, `config`, `origin`, `returnPath`. All belong to browser-started runs; mint the session on your server instead.