What does a shopper see if one product in their cart can't be delivered to their address?

At checkout, as soon as the customer enters a pincode, Wcart checks every product in the cart. If one can't go there, a red notice names it, for example: "Glass Table is not available for delivery to this location. Please choose a different address."

The Place Order button stays disabled until they change the address or remove that product. The check is repeated when the order is placed, so the order can't slip through.

Set up which products go where in your Delivery Restrictions plugin. Orders you create yourself in the admin can skip the block for phone or counter orders.