If you can’t find an error code/message associated with a transaction, click on the details options against the particular transaction in the My recent activity tab on your Overview page over at the PayPal web interface (see screenshot below). 

My_Account_-_PayPal.png

You can also make use of PayPal’s advanced search option by navigating to 
History >> Advanced Search to filter through and obtain transaction details.


History_-_PayPal.png