Im trying to connect my website with paypal and i have the index page where i am getting the order price, the order name and then i refer them to the process.php using get for processing.Howevever,on running the process.php file i am getting this error
Error : Security header is not valid
Array
(
[TIMESTAMP] => 2014%2d10%2d07T17%3a22%3a00Z
[CORRELATIONID] => 37359d983e7a
[ACK] => Failure
[VERSION] => 109%2e0
[BUILD] => 13243702
[L_ERRORCODE0] => 10002
[L_SHORTMESSAGE0] => Security%20error
[L_LONGMESSAGE0] => Security%20header%20is%20not%20valid
[L_SEVERITYCODE0] => Error
)
How can i solve this error.Please Assist