Retired Documentation: You are using the documentation for version 1.7.3 which was retired in 2013. Go here for the latest version documentation or check here for your available upgrades to ExpressionEngine 3.
IPN not being recorded by Simple Commerce Module
When testing the Simple Commerce module sometimes the IPN gets sent by PayPal but the Simple Commerce module does not record it.
Troubleshooting IPN
Confirm these settings:
:- Both buyer and seller are verified.
- Buyer is logged in to ExpressionEngine when purchasing.
- The email address in the Simple Commerce module matches that entered into PayPal. This is case sensitive.