I am working Paypal with using API. I am getting error like this. I searched in Google.. i got only one suggestion regarding paypal api credentials. but the below code is working in another server. can anybody tell me what may be the reason.Thanks inadvance
Error : Security header is not valid
Array
(
[TIMESTAMP] => 2014%2d02%2d10T16%3a09%3a39Z
[CORRELATIONID] => 6df53789eb1fb
[ACK] => Failure
[VERSION] => 76%2e0
[BUILD] => 9605603
[L_ERRORCODE0] => 10002
[L_SHORTMESSAGE0] => Security%20error
[L_LONGMESSAGE0] => Security%20header%20is%20not%20valid
[L_SEVERITYCODE0] => Error
)