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The e-commerce.

Security header is not valid


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Hiya all.


I've just installed my first instance of osCommerce onto a new site. We were just testing our first product using our paypal integration (paypal express checkout) and it threw up this header. I searched on the paypal site and got something about ensuring the design parameters are correct. However, I'm guessing that osCommerce has already sorted all of this out as it is the only recommended e-commerce solution on paypal when it mentions 3rd Party Applications.


So, where am I going wrong?


Many thanks in advance.



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