Hello,

You can for example retrieve total price from current shopping cart and according this price allow/deny access for the user to move to the next step in shopping cart.

You can retrieve information about the total price from current shopping cart using the following code:

ShoppingCartInfo sci = CMS.CMSHelper.CMSContext.CurrentShoppingCart;
sci.TotalPrice

After that you can decide whether user will be allowed to move to the next step for example in the method btnNext_Click() in ~\CMSEcommerce\ShoppingCart located in the ShoppingCart.ascx.cs file:

Example code:

ShoppingCartInfo sci = CMS.CMSHelper.CMSContext.CurrentShoppingCart;
if ( sci.TotalPrice > some value){
this.CurrentStepControl.ButtonNextClickAction();
}
else{
Label1.Text = "not allowed to continue";
}

To apply this just for one site, you need to add an additional condition where you will check the current site.

Best regards,
Boris Pocatko