You can prevent your customers from placing an order if the order subtotal is above or below a specified amount.

Perform the following steps to set a minimum or maximum order checkout constraint.

1. Login to SEO-Cart and go to Configure->Order Page Settings
2. Scroll to the "Order Checkout Constraints" section.
3. To set a minimum order amount, enable the checkbox for "Disable checkout for orders under" and specify the minimum subtotal amount.
4. To set a maximum order amount, enable the checkbox for "Disable checkout for orders over" and specify the maximum subtotal amount.
5. Update your settings.