> For the complete documentation index, see [llms.txt](https://docs.samita.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.samita.io/b2b-lock-password-protect/lock-1/creating-a-checkout-lock.md).
# Creating a Checkout Lock
This Lock type prevents customers from completing checkout with restricted products. Customers can still add those products to the cart, but the order will be blocked once they proceed to checkout.
An error message will appear to inform customers of the reason:
### **Setup Checkout lock**
**Step to manage:**
1. From the app's dashboard page > go to **Locks** page > **Create lock**
2. In the **Lock setup** tag, set up Lock name.
3. In the **Content to lock** section, choose content: **Checkout lock**
* Scroll to the **Product scope** section. You can set up this lock for **All products** or Specific products (**Manual products**)
In this **Manual products** setting:
* **Only selected products**: The lock will be applied for only some products added to this setting.
* **All products except selected**: The lock will still be applied for All products but excludes the products added to the setting.
4. In the **Conditions settings** setting, set up condition to apply this lock for products.
If a customer proceeds to checkout and either the cart items or the customer information match the rules configured in the app, the system will **automatically display an error message on the checkout page**. In this case, the customer will **not be able to complete the checkout and create the order**.
There are currently 4 conditions for Customer.
*For example:*
*Restrict customers from being able to purchase all products in your store, unless they login to your store first.*
* Please use condition: **Customer login**
* Click **Add another condition** to have more rules for this lock:
* Set up Error message. This message will show at checkout page.
5. After finishing the setup, click **Save** to complete the Lock setup.
***
### **Add checkout rule in Shopify Checkout page**
You have finished the Lock setup part. Now to officially activate the lock rule at checkout page, you have to add **Sami B2B Lock** to your **Shopify Checkout page**.
1. Go to **Shopify Settings** > **Checkout** > Scroll down to the bottom of the page > **Checkout rules** > **Add rule**:
2. Click **Validation** to complete the checkout rules:
3. **Turn on** the validation:
The configuration is completed. You can check the result in the front store now.
{% hint style="info" %}
Don't forget to activate the app in your theme. Kindly refer to [this document](https://docs.samita.io/b2b-lock-password-protect/general-1/enable-app-embeds-on-theme) to know how to embed the app.
{% endhint %}
---
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