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# Checkout alerts

Block payments and display error messages directly on the checkout page for Shopify Plus stores
Unlike Shopify Functions, this extension isn't limited by line item quantity and offers better optimization.

1. Open Checkout rules

Go to **Pareto app admin** and click **Checkout alerts** in the left menu

2. Add the app block to your checkout page

Follow [the guide](https://help.omegatheme.com/en/article/enable-the-app-14nz90o/) to add the **Pareto - Limit Checkout** block to your checkout page inside the Shopify Theme Editor

3. Enable how notification

Check "**Show notification**" option to display an alert when the customer's order does not meet the limit rule. 


![The Checkout alerts settings page in the Pareto admin, with the "Show notification" toggle enabled to display an alert message on the checkout page when an order violates a limit rule.](https://storage.crisp.chat/users/helpdesk/website/-/8/3/8/3/8383e5404a31c000/image_lwftaw.png)
4. Enable show product component (optional)

Checked "**Show product component**" option to display details of products that do not meet the limit rule. This allows customers to add or remove products to ensure their order complies with the rule.

![The Checkout alerts settings page showing the "Show product component" option enabled, which displays a list of non-compliant products on the checkout page so customers can adjust their order.](https://storage.crisp.chat/users/helpdesk/website/-/8/3/8/3/8383e5404a31c000/image_1koch0s.png)

**Important notes:** When enable Checkout Alerts works automatically across Shopify channels, including: Shopify POS, Online Store, Shop App. If a customer’s order violates your limit rules, the checkout will be blocked and the alert message will appear.