Appointments+ plugin is not working

I have installed this plugin and used the Tutorial to set it up and add my appointments. It's all working well on the front end till I pick an appointment. i fill in the form while logged out using another browser (chrome) and after filling in all required fields and clicking the Click Here to Confirm This Appointment Button, nothing happens - the circle is spinning but it never goes to Paypal. I click Cancel on the form but the time that was selected for the appointment is no longer shown as available. Please help :slight_smile: