Order ID missing

Hi, I have completed a form for people to fill in, but some people have contacted me to say that they are getting a message saying Order ID is missing from the form submission when they are trying to fill it in.
Can you advise me how to fix this please,
Thanks,
Louise

Hi Louise!

You are receiving this error because you have not finished connecting your form to PayPal yet:

Please click on the Connect with PayPal button and follow this guide to finish setting up the PayPal integration on your form: How-to-Integrate-Form-to-PayPal-Checkout.