We have found that Paypal sometimes blocks purchase of items that have certain words in the title (and any other books that are being purchased with it). As far as we can understand, the words that Paypal is currently blocking include: Persia, Persian, Iran, Tehran, Guantanamo, Cuba, Aleppo, Mosul, Syria, Syrian, Pyongyang, North Korea. If you are unable to use Paypal to purchase your chosen book (like "The Beekeeper of Aleppo" or "Cuba (Revised) The Sights") this may be the reason. Regular credit card payment will work. We apologise for this issue which we have no control over.