# Get started with legacy checkout extensions

> The archived development workflow for legacy Shoplazza checkout extensions built with the shoplazza checkout command: create, dev, push, and publish.

:::caution Legacy Documentation
This page describes the legacy checkout extension development process based on the `shoplazza checkout` command. For the latest development process, please refer to [Building Checkout Extensions](/docs/app/extensions/checkout/add-checkout-extension).
:::

:::note
The Getting started guide for ​​Checkout Extension Development​​ in this article is based on the use of the ​​Shoplazza CLI​​ (specifically the **shoplazza checkout command**).

Additionally, you can also create and develop extensions using the ​​Shoplazza CLI​​ (via the **shoplazza app command**). For more details,[ please refer to this documentation](/docs/app/developer-tools/shoplazza-cli/app-command/usage-guide).
:::

# Step 1: Install the latest Shoplazza CLI

```shell
npm install -g shoplazza-cli
```

# Step 2: Create a project template

During creation, you’ll be prompted to enter your store URL and token, which can be obtained in admin backend under **Apps -> Manage Private Apps -> Create App**. You will also be prompted to enter an extension name. Multiple extensions can exist within a single project for easier management, and they won't affect each other.

```shell
shoplazza checkout create
# Install dependencies
npm i
```

# Step 3: Local Development

Extensions support local development and allow the insertion of local extension code on the live store's checkout page. This only works in your browser. 

First, start the local development server:

```shell
shoplazza checkout dev
```

Then, enable developer mode by running the following command in the browser console:

```javascript
CheckoutAPI.extension.DEV_switchDevMode();
```

You'll now see the changes reflected in the checkout page.

# Step 4: Preview the Extension

After local development is complete, you can push the extension to the store for preview.

```shell
shoplazza checkout push
```

Visit the preview URL to view the changes.

# Step 5: Deploy the Extension

After the preview test is completed, you can publish the extension for all users to see.

```shell
shoplazza checkout deploy
```

Or to remove the published extension:

```shell
shoplazza checkout undeploy
```