Error message "no order id" after submitting

Thank you for reaching support,

I checked the form, and it seems that the PayPal checkout has not yet been connected, please click on "Connect wit PayPal":

Once connected, the "Checkout Button" should appear at the bottom and would serve as the submit button:

I was able to successfully make a submission on my clone form which is on Test mode:

Here is a Related Guide: https://www.jotform.com/help/542-How-to-Integrate-Form-to-PayPal-Checkout

I hope that helps.

Best.