Need a Payment Gateway put in my Scheduling Calendar

Here is the process: 1) Customer goes to our website and goes to our calendar. 2) They pick service that they want to schedule on our calendar. 3) Now that they picked a service and scheduled that service, they are now setting the appointment online. They are actually scheduling the appointment online REAL TIME like this sample site. [login to view URL] 4) Now that they set the appoint for the service, we need to have the PAYPAL checkout after appointment is set. This is what you will incorporate into our site. We need this done right away within our calendar scheduling system so when they reserve the SERVICE, they will be able to charge for that service and the checkout will be in place. We have an admin panel, you can build that into our admin panel so all our customer can have that option. By accepting this bid, you agree not to cancel and to start this job right away and complete on time. Thank you for bidding!