App or Widget that stops customer moving to payment if they are in the wrong postcode

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Hi There!

I am looking for an app or widget that stops our customers moving forward to payment if they are not in our delivery area. 

We are a local start up food business that only delivers within a 10km radius. I have seen on some sites that when you add in your address to the shipping information section of check out and press the button to payment a pop up comes up to say "we cannot deliver to you". See attached image, does anyone know what this is?


Shipping Address checker do you know what app this is.png