1. When you click "Pay Now with Paypal" Button you will be taken to PayPal site.
2. You will be Required to Enter Few details in "Purchase Details"a. In Description box: Enter Patient Name, Physician Name and Visit Date or Invoice# if you remember.
b. In Price per item box: Enter Amount Due or Amount you want to Pay.
C. Quantity is always 1 and you don't need to change it.