AppointUp Plugin Version 1.0.5

I have the appointup plugin installed and did not want to use Paypal. I choose the cash option and when the appointment is booked he page reloads and above the form I get the message "Your appointment has been booked successfully. You have to pay the amount of 50USD at the time of appointment. Thanks".

1. Is there a way to change that message to a custom message I want to use?
2. Is there a way to change the location of the message so it shows in the form section and not above it?
3. If no to question 2 can the text color be changed so it stands out more?
4. Is there a way to add stripe as an option?
5. Is it possible for the transaction to complete without the page reloading and display the confirmation message under the form?