I implemented paypal express checkout using the following document
http://kb.cs-cart.com/paypal-express
I tried to test it before going to live, so i get the sandbox testing accounts from paypal sandbox and put those credentials in configure tab(check the attached screen shot)
In checkout page when i choose the paypal payment method and click on "submit my order " button its again redirecting to the same checkout page not to the paypal website
After that i changed the configuration settings “Test/Live mode:” as Live and again i tried with the above process now its showing the following error
“Error 10002 Security error: Security header is not valid”
could you please help me how to test the paypal express using sandbox testing account
Thanks&Regards,
Anil kumar