Paypal Express Checkout – Security header is not valid (10002)

Posted: March 20, 2014 in Knowledge Base
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You may receive this error in your PayPal development. The message is very confusing, but the reason could be as simple as below.

You are trying to connect to PayPal (or SandBox) using the wrong credential.

In my case, I was using Sandbox credential to connect production site …

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