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Alex Rivera
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I'm implementing Express Checkout in PayPal. I have no problem with the first two steps, SetExpressCheckout and GetExpressCheckout . But when I use DoExpressCheckout , I encounter the error "Security header is not valid". The API credentials are the same! I've fixed it by changing the $environment to live in DoExpressCheckout . (The difference $environment makes is that it'll use https://api.sandbox.paypal.com/nvp/ instead of https://api-3t.$environment.paypal.com/nvp ) But why? Is there something wrong with https://api-3t.$environment.paypal.com/nvp ?
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