There are many workflows that need to be enabled in order
for this functionality to work.
1. First ensure that it says "Connected" under Curl on the
settings screen (Other Features / Settings > Settings /
Ad Peeps uses CURL to contact PayPal.
2. Ensure you have enabled IPN in your PayPal Merchant
3. View IPN History from your PayPal Account, this will tell
you the status of the notifications such as when they were
sent, what was sent and if it was successful.