More Paypal issues with PPV

Hi

Having problems completing any transactions using PPV. The first button just refreshes the post and gave this error msg at the end of the post:

There was a problem connecting to PayPal to setup your purchase. Please try again.

10002 – Security error – Security header is not valid

The other two buttons connects to paypal but once I enter the sandbox p/w it gave the following error on paypal:

The link you have used to enter the PayPal system is invalid. Please review the link and try again.

I read somewhere that I should test it with a Live setting but I’m really not sure how to do this without incurring any cost on my part.

The PPV post can be found here: http://sme.halalmedia.net/tracking-the-wind-in-halal-marketplace-a-global-halal-industry-overview/

Please help.