Booking form - PayPal error

I'm currently using a booking form through your site.  It is embedded properly but when my clients go to submit the form an error pops up "invalid paypal"

Do you have a PayPal account? You would need to signup for one if you don't.

https://www.paypal.com

Its highly likely that the PayPal integration isn't setup correctly. Please make sure you have supplied the correct email address

If you are sure everything is correct but it still isn't working then its possible the integration is broken. To resolve this simply delete your PayPal integration and add it again. Don't worry it will remember your products for sale.