Hi,

I tried to setup the PayPal Express & Direct for nopcommerce without Sandbox.  I also have SSL enabled during the checkout process.   However, I got the following error when I click the PayPal Express button or the "Confirm" button for Paypal Direct:

LongMessage: Security header is not valid
ShortMessage: Security error
ErrorCode: 10002

My PayPal Pro business account works fine for my other oscommerce websites.

What should I put in the "Signature: " textbox under the Paypal Express & Direct configuration?  I downloaded a text file from PayPal which has my account's private key and certificate?  which one I use?

Thanks!