Paypal's "Security header is not valid"

Posted by Paypal on Stack Overflow See other posts from Stack Overflow or by Paypal
Published on 2009-11-11T02:46:27Z Indexed on 2010/06/16 8:22 UTC
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paypal

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checkout

I'm implementing the Express Checkout?

I have no problem with the first two steps:SetExpressCheckout and GetExpressCheckout,but met the "Security header is not valid" at DoExpressCheckout.

The API credentials are the same!

I've fixed it by changing the $environment to live in DoExpressCheckout.(The difference is that it'll use https://api.sandbox.paypal.com/nvp/ instead of https://api-3t.$environment.paypal.com/nvp)

But why?

Is there something wrong with https://api-3t.$environment.paypal.com/nvp?

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