Paypal pro integration: Error on submit "Security header not valid"

I have 2 problems with this form :

- It refuse to submit because all fields are required, even if they are all filled!

- When it goes through, Jotform message is "Security header not valid".

Thanks!

https://form.jotformeu.com/73281693984370

We're sorry for the inconvenience.

I checked your form but I wasn't able to replicate any issue with required fields.

I was able to replicate the issue with security header not valid error. That problem is usually related to the payment credentials used.

I checked your form and noticed that your payment integration is in sandbox mode:

Please try disabling Sandbox mode and test your form again.

Let us know if the issue persists.

Thank you!