asp.net paypal

I have a asp.net/c#/web form website with masterpage and the form is using get method.

Now, I want to create a simple webpage and of course using default masterpage
my question:

1. I want a web form to accept paypal (it is subscription website) and how can i handle it by using get method. Paypal accepts post method only

2. Can you show me some codes to work with paypal that have website charge as subscription?
3. Can you show me a way after the payment is successfully posted the payment, it will redirect to anywhere I want
like success.asp?Id=123

Thanks