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Paypal Invalid Security Header MessageAsked by Ohiolesbianfest on May 04, 2015 at 02:39 PM
When I try to submit a form to Paypal, the error message says "security header is not valid". What does that mean?
This is a re-post of a comment on Paypal Incomplete Payments FAQ
The error message you are getting is because the API credentials you entered are not correct in the PayPalPro wizard,
you might be entering the wrong API Signature,Username or passwords, during integration with PayPal there is button for testing integration, please use this to test the credentials you supply before proceeding
Read on how to obtain your API signature at this link: https://developer.paypal.com/docs/classic/api/apiCredentials/#creating-classic-api-credentials