Hi, I am about ready to start a web site template store business. But I would like to know if theres some software like a E-store that would take the orders and payment. And after payment has been recived it automatically sends the customer an email with an address where to download the template. Thank you for any help.

you could check out hotscripts.com
you should find what your lookin for

ANy third party that is made to sell soft will be able to help you. Check Google for Third Party Processors.