Trying to buy on my webshop with my spouses Visa, I get in return "following error: Security header is not valid". Is this message from Cubecart or directly from PayPal?
In order tot integrate PayPal in my webshop, I should place some code somewhere.
1. How can I edit the code of my shop?
2. How can I define the spot in the code where I have to place the PayPal code?
Thanks for helping me out, I'm a newbie.