What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.

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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.

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    Paypal Express Error: Security header is not valid

    Asked by VintiqueFlea on March 25, 2017 at 01:31 PM


    Can you please help me? I am currently integrating my client's paypal account to this form I'm making for her business. But unfortunately, when I'm testing the form... I'm getting an error. Please see screenshot below. 


    Not sure why. Please get back to me asap. Form link: https://form.jotform.me/70802597717464

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    JotForm Support

    Answered by Mike on March 25, 2017 at 06:00 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.

    If you need any further assistance on this, please let us know.