Knowledgebase: Payment Gateways > PayPal
Paypal Express Checkout Error: Security header is not valid (10002)
Posted by Jim McCormick on 10 June 2011 09:09 AM

Getting Security Header is not valid error usually means:

- You are using the wrong API credentials

- Or you are sending the right credentials to the wrong environment.

First find out whether you need an API signature or API certificate. Then login to your account and generate the API credentials and specify that in your module.

Lastly, check that you are sending the transaction to the live server and not the sandbox server.

 

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