eCart - Paypal Integeration

Hello I have been reading most of the posts for the past few days. I have check the user name, Signature and Passowrd, and still getting the following:

Transaction Not Completed
KiSell_1257535408_biz_api1.gmail.com1257535416AnV0ilrwr81e58go09jDO97KN-OnAA.tjFhnC5LeZr6JPgswdIcQuG.J2.2049.00http://media.oneapex.com/pp_confirm.asphttp://media.oneapex.com/pp_cancel.aspAuthorization

AnV0ilrwr81e58go09jDO97KN-OnAA.tjFhnC5LeZr6JPgswdIcQuG.J2009-11-16T23:22:23ZSuccessebf8f216291cf2.201105502EC-9RE45147X8639220M

KiSell_1257535408_biz@gmail.com1257535416AnV0ilrwr81e58go09jDO97KN-OnAA.tjFhnC5LeZr6JPgswdIcQuG.J2.20EC-9RE45147X8639220M

AnV0ilrwr81e58go09jDO97KN-OnAA.tjFhnC5LeZr6JPgswdIcQuG.J2009-11-16T23:22:58ZFailure94750bc312d14Security errorSecurity header is not valid10002Error2.201105502unverified
PayPalNone


KiSell_1257535408_biz@gmail.comP@ssw0rdALKG8ML5JZEGA2.20EC-9RE45147X8639220MSale49.000.000.0049.000.00WebAssist.eCartASP.Pro.ECO49.00125401

ALKG8ML5JZEGA2009-11-16T23:22:58ZFailurea5e36843caebbSecurity errorSecurity header is not valid10002Error2.201105502nonenoneNonenonenone

Can anyone please shed some light on my problem??

Thanks

The error you are getting:
Security error Security header is not valid


occurs if you have not excepted the billing agreement after requesting the API credentials.

It may also occur if you are using Live API Credentials when processing the transaction through the paypal sand box or vice versa.

Some the credentials are just bad, and you need to request new ones.