PayPal sometimes block transactions on their end. This is normally due to their strict security compliance. But can also be because the reward is being sent to what PayPal describe as a prohibited country. See the list of their blocked countries below.
PayPal Blocked Countries (their official list)
- Burma (Myanmar)
- Cote d'Ivoire
- Democratic Republic of the Congo
- Liberia (Former Regime of Charles Taylor)
- Persons Undermining the Sovereignty of Lebanon or Its Democratic Processes and Institutions
- Nigeria (they allow merchant accounts but can't send money to Nigerian personal PayPal)
- North Korea
- Sierra Leone
- Western Balkans
PayPal transactions are almost instant, so if you haven't received your reward after entering your email address please contact email@example.com for more help.