---
title: Initialize using script tag
slug: crypto/initialize-using-script-tag
docTags: 
createdAt: 2023-10-19T09:55:57.409Z
---

## Include script dependency 

When using script dependency you can include the javascript's url with in the head section of the application.  X.Y.Z is the version of the javascript file, for instance: `https://pay3.money/pay3-sdk-pay/index.global.1.2.3.js`

:::CodeblockTabs
index.js

```html
<head>
  <script src="https://pay3.money/pay3-sdk-pay/index.global.X.Y.Z.js"></script>
</head>
```
:::

&#x20; This script creates a singleton instance of the Pay3 class and exports an object `window.pay3Pay`

## init()

Init saves the parameters which will be used during future function calls. It also registers a listener to listen for messages from Pay3. Pay3 team shares `hostname` and `clientId` during onboarding. &#x20;

**Parameters**

1. **hostname**: Pay3 will be opened in a new window using this hostname prefix. The host name is environment dependent.&#x20;
2. **clientId**: A unique client ID is created by the Pay3 team to identify the client application. The client ID is environment dependent.
3. **lang&#x20;**(optional, default value 'en'):  This parameter specifies the language preference for the Pay3 SDK. The strings used follow two letter language code as in ISO 639-1. Example **pt** for Portuguese, **en** for English.

:::CodeblockTabs
index.js

```javascript
window.pay3Pay.init(hostname, clientId);
```
:::

***