paypal pro issues

I'm trying to use Paypal pro with eCart and I'm running into some trouble. I've used the checkout wizard to create my pages and entered in the correct API information. When I try and test it I always get the fail page, even when I try and use the express checkout option. As the form seems to post to the same page (checkout.php) I can't even tell if the script is making any calls to Paypal. Any ideas on how I would go about debugging this? I'm a bit lost at sea at the moment...

Thanks in advance, R.

You can use the bindings to show more specific information about why the error page is showing. Use the Ecart->Local checkout bindings accessed from the plus button in the bindings window.

Ah, that's helpful, I assume you put these bindings in the error page. I'm getting the following: errorSecurity header is not valid10002Error

Thing is I thought I'd set this up to hit the paypal sandbox and not the real server so in theory I shouldn't be getting this error right? Or does the checkout page have to have https running regardless for the transaction to pass?

Final quick question: I can assume from the error code above that I am indeed actually hitting the paypal server right?

You are indeed hitting the paypal server. This error means that your username, password, or security key are not valid. If you are using sandbox, you need to log into sandbox and make sure you are using that api security information.

Thanks Ray, as long as I know I'm at least getting to Paypal the rest is solvable (I hope)

Cheers, Russell