Payment Form Using Paypal and Google Checkout.

I have a website where I sell movie tickets, I want to stop having to do everything manually and simply have a form where they choose how many tickets they want and have them pay, ? I want to the form to only send form information after payment has been successful, I also have another site which requires subscription I want to be able to have the customers sign up and only have access for the time they paid. ? This is separate. But would be great to have one developer work on both thanks in advance.? More information will be given after finished work.