Security header invalid with paypal

We have answered your first question here: https://www.jotform.com/answers/1166745

The error you're getting with the Paypal field usually means that the Paypal API credentials you've entered are incorrect or invalid. 

You can follow this guide on how to integrate Paypal Pro in your form. https://www.jotform.com/help/391-How-to-Integrate-Form-with-Paypal