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Personal account stopped working and can't find correct API fields

Posted on

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 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,

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