PayPal will be performing maintenance from 02/25/16 10pm PST to 02/26/16 4pm PST. During this window, there will be 6 events of approximately 1 minute each. These events may result in “10001 – Internal Error” and/or “520002 – Internal Error” messages when placing or processing orders using PayPal.
Please see PayPal’s status blog for more information.