Rdio is a good example. They have a monthly subscription of $10 to use their online service. They made an iOS app that allows you to use their service on your iPhone. All you need is a registered account. From the iOS app, if you are new to Rdio, they prompt you to either make an account online, or pay the $13 a month via in app purchase. The added $3 accounts for the 30% apple takes.
Rdio is a good example. They have a monthly subscription of $10 to use their online service. They made an iOS app that allows you to use their service on your iPhone. All you need is a registered account. From the iOS app, if you are new to Rdio, they prompt you to either make an account online, or pay the $13 a month via in app purchase. The added $3 accounts for the 30% apple takes.