Trouble setting up Paypal. Please Help

[ntech25]

We are sorry for the inconvenience. The PayPal account authentication settings are not yet set up, or the API security information is incorrect. We are unable to complete your transaction. Please notify the store owner so they can correct this problem. (10002) 10002 Security error - Security header is not valid

I keep getting this error when I try to check out item on www.ShopSaveCenter.com

I put in API informatiion. Set up all settings for paypal.

If anyone could help me get it set up.

Thanks

[ntech25]

Finally got it. Thanks Guys

[Kristikat]

Could you please tell me what it was that you did to correct this problem? I am having the same issue and cannot find where the problem is.

Thanks so much!

[Scirrocco]

I am also setting up Paypal and have the same issue. I get a 10002 Security header is not valid message when attempting to check out using Paypal.
I followed the instructions on Paypal's site and in the payment module.
What did you do to fix the problem?! Please help!

[DrByte]

It means that you've not entered valid information for the API Signature/User/Password settings.