We are using PayPal Express checkout (it's API) to let customers checkout products in our shop and add the delivery address at the same time.
We only ship to Germany and when a customer checks out, returns to our page and we get to know vie the PayPal API his address is not in Germany, we don't capture the authorized payment. Sometimes however, customers try to trick us and write AT-1234 in the zip field, to indicate they want shipping to austria. They let the country field with the "Germany" value.
Is it possible to let PayPal validate the Address during Express Checkout, such that invalid zip codes cannot be added?