Hi, I have had a Zencart site built for me that has worked with Paypal Express Checkout with no problems over the recent years but has just recently had a problem where I am getting the error:
(10002) 10002 Security error - Security header is not valid
Looking online it appears that my API details are incorrect (see https://www.paypal.com/va/smarthelp/article/why-did-i-get-api-error-code-10002-ts1030) and I would like to confirm I am using the correct ones.
The problem I have is that I have a Personal account which has been completely fine but when I login to Paypal I cannot find a place where I am able to get these details.
Can anyone point me in the correct direction so I can get this sorted and get back to making sales as before.
Many Thanks,
