PayPal Express receiving "Security header is not valid" error

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    cecibispo2017
    Asked on March 14, 2019 at 06:47 PM

    paypal express error

    na error has ocurred, please contact form administrator for assistence

    security error

    security header is not valid

    Screenshot
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    jherwin
    Answered on March 14, 2019 at 09:48 PM

    The security header is not valid error usually means that there is an issue with provided API credentials.

    Please re-check the PayPal API credentials on that form. Also, please note that PayPal API credentials for Live and Sandbox modes are different.