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paypal: Security header is not valid

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Hi guys

I have been to Paypal and created the APIs that are required. I've also enabled Paypal Express with the os2.2 install. Sandbox is enabled.

 

I now have a nice paypal button as a payment option however when I click on it I get the following error:

 

Security header is not valid

 

Can anyone help?

 

http://www.nissan-depot.co.uk

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I have the same problem

What are the exact steps to replicate this? I cannot seem to replicate it.

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For my situation I added the Paypal Express Checkout option, entered my Paypal API data, then turned it to "true"

 

Upon hitting the paypal button, the next page shows a red header displaying the text "Security Header is Not Valid"

 

I have tried with the standard 1.0 paypal module and the newer one - same result.

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SOLVED:

 

Has to do with using the Live credentials vs. the Sandbox credentials. I was using live with the sandbox.

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