I am building a website where people join and create an account to sell music to visitors and receive money through Paypal. The steps would be.
Persons buy music and send money to members Paypal account, then a response from Paypal should be sent to website, to verify payment and then insert results into database and send link to buyer to download music.
I basically have everything else, but not sure which Paypal service to use in order to achieve the above results. I was looking at IPN but that involves the member(seller) setting a response URL in their Paypal account in order for the response to be send to the website.
Any help in this regard would be greatly appreciated.