# Initialize

You can pass in different handler functions like the **onLoad**, **onStart, onRestart, onPassStep, onComplete** or **onError** method to handle different events of the verification flow to the **init** function.

<table data-header-hidden><thead><tr><th width="367">Argument</th><th>Description</th></tr></thead><tbody><tr><td><p></p><pre class="language-javascript"><code class="lang-javascript">let onLoad: () => void;
</code></pre></td><td>Method that is being called once a verification flow is loaded. You can use this to show your own loader and then show <strong>div</strong> <strong>allpass</strong>.</td></tr><tr><td><pre class="language-javascript"><code class="lang-javascript">let onStart: (event: {
  appKey: string;
  transactionId: string;
  externalUserId: string;
  flowId: number;
  mode: 'LIVE' | 'TEST';
}) => void;
</code></pre></td><td><p>Method that is being called once a user starts the verification flow.<br><strong><code>appKey</code></strong>: API Key<br><strong><code>transactionId</code></strong>: UUID of the verification.  You can use this to query our API.</p><p><strong><code>externalUserId</code></strong>: External user ID (user ID in your system)<br><strong>flowId</strong> : Workflow ID <br><strong>mode</strong> : Live or Test mode</p></td></tr><tr><td><pre class="language-javascript"><code class="lang-javascript">let onRestart: (event: {
  appKey: string;
  transactionId: string;
  externalUserId: string;
  flowId: number;
  mode: 'LIVE' | 'TEST';
}) => void;
</code></pre></td><td><p>Method that is being called once a user starts the verification flow, but the  verification is not completed</p><p><strong><code>appKey</code></strong>: API Key<br><strong><code>transactionId</code></strong>: UUID of the verification.  You can use this to query our API.</p><p><strong><code>externalUserId</code></strong>: External user ID (user ID in your system)<br><strong>flowId</strong> : Workflow ID <br><strong>mode</strong> : Live or Test mode</p></td></tr><tr><td><pre class="language-javascript"><code class="lang-javascript"><strong>let onPassStep: (event: {
</strong>  appKey: string;
  transactionId: string;
  stepType: string;
  externalUserId: string;
  flowId: number;
  mode: 'LIVE' | 'TEST';
}) => void;
</code></pre></td><td><p>Method that is being called once a user pass any step of the verification flow.</p><p><strong><code>stepType:</code></strong>The step can be one of the following</p><p><code>"intro" | "biometry" | "documents" | "scan" | "diia" | "complete"</code></p><p><strong><code>appKey</code></strong>: API Key<br><strong><code>transactionId</code></strong>: UUID of the verification.  You can use this to query our API.</p><p><strong><code>externalUserId</code></strong>: External user ID (user ID in your system)<br><strong>flowId</strong> : Workflow ID <br><strong>mode</strong> : Live or Test mode</p></td></tr><tr><td><pre class="language-javascript"><code class="lang-javascript"><strong>let onComplete: (event: {
</strong>  appKey: string;
  transactionId: string;
  externalUserId: string;
  flowId: number;
  mode: 'LIVE' | 'TEST';
}) => void;
</code></pre></td><td><p>Method that is being called once the verification is completed.</p><p><strong><code>appKey</code></strong>: API Key<br><strong><code>transactionId</code></strong>: UUID of the verification.  You can use this to query our API.</p><p><strong><code>externalUserId</code></strong>: External user ID (user ID in your system)<br><strong>flowId</strong> : Workflow ID <br><strong>mode</strong> : Live or Test mode</p></td></tr><tr><td><pre class="language-javascript"><code class="lang-javascript"><strong>let onError: (event: {
</strong>  appKey: string;
  transactionId: string;
  error: string;
  stepType?: string;
  externalUserId: string;
  flowId: number;
  mode: 'LIVE' | 'TEST';
}) => void;
</code></pre></td><td><p><strong><code>error:</code></strong>  The reason why the flow failed. </p><p><strong><code>stepType:</code></strong>The step where the error occurred, can be <strong>undefined</strong> or one of the following</p><p><code>"intro" | "biometry" | "documents" | "scan" | "diia" | "complete"</code><br><strong><code>appKey</code></strong>: API Key<br><strong><code>transactionId</code></strong>: UUID of the verification.  You can use this to query our API.</p><p><strong><code>externalUserId</code></strong>: External user ID (user ID in your system)<br><strong>flowId</strong> : Workflow ID <br><strong>mode</strong> : Live or Test mode</p></td></tr></tbody></table>

```javascript
Allpass.init({
  onLoad: () => {},
  onRestart: ({appKey, transactionId, externalUserId}) => {},
  onStart: ({appKey, transactionId, externalUserId}) => {},
  onPassStep: ({appKey, transactionId, stepType, externalUserId}) => {},
  onComplete: ({appKey, transactionId, externalUserId}) => {},
  onError: ({appKey, transactionId, error, stepType, externalUserId}) => {},
});
```

{% hint style="info" %}
If user doesn't finish verification process and current session is still active - we can automatically start this verification. In order to make it you should call **restart** after **init** method.
{% endhint %}

```javascript
Allpass.restart();
```

Also it could be chaining with an init method:

```javascript
Allpass
  .init({onComplete: ({appKey, transactionId, externalUserId, flowId, mode}) => {}})
  .start(accessToken);
```