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!