I have implemented paypals recurring billing option in my website. My website do not have the SSL certification. I have used NVP method to implement recurring billing.
It worked fine in sandbox environment. When i configured it with live paypal account information, it is throwing a security header is not valid error.
Below is the response that i got from paypal.
Array ( [TIMESTAMP] => 2010-01-29T15:21:53Z [CORRELATIONID] => d3d0cb1935154 [ACK] => Failure [VERSION] => 50.0 [BUILD] => 1157804 [L_ERRORCODE0] => 10002 [L_SHORTMESSAGE0] => Security error [L_LONGMESSAGE0] => Security header is not valid [L_SEVERITYCODE0] => Error )
Kindly help me ASAP.