Security header error when integrating paypal pro

Usually this error was due to the API having incorrect information in the settings. Please check on your form https://www.jotform.com/42657232057959 and make sure you have provided the correct/valid API settings. 

It must be the same issue that was resolved here.

https://www.jotform.com/answers/617993-PayPal-Security-header-is-not-valid-error

Hope this help. Let us know if still not working.

Thanks.