Sheet1
Hide the rows below that you doesn't want the user to edit. Of course, you can calculate these values instead.
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Product
Item number
Currency code
Amount
Shipping
Option 1 Note
Option 1b We will call you to confirm your order.
Option 2 Attention
Option 2b Valid contact information is required.
Return Url http://www.yoursite.com/aborted.htm
Cancel Url http://www.yoursite.com/success.htm
Hide all these rows!!
The template add=1&business=%business%&item_name=%item_name%&item_number=%item_number%&currency_code=%currency_code%&amount=%amount%&shipping=%shipping%&on0=Note&os0=%os0%&on1=%on1%&os1=%os1%&return=%return%&cancel_return=%cancel_return%
replace stuff in the template
Replace some dangerous chars and add site