Question about subscriptions in In-App purchase

After attending an iPhone dev conf in San Jose - I left with more questions about In-App purchasing than when I started. Here's what I was wondering:

You can set a purchase as a type "subscription". cool. But, it doesn't say anywhere about how the subscription is serviced - how does apple know to charge once a month? once a week? one every six months? etc. I was told that apple doesn't really do that - only that it calls it a type of subscription. That the developer must be the one to monitor the subscriptions and then submit them to apple when they are due up - but this leads to another question - then why have the subscription type? If I monitor the days until it's due, then submit it to apple as an application charge - what开发者_Python百科's the difference in merely making separate charges on a regular basis?

it seems to me, apple is doing nothing on the subscriptions - only declaring the type - all the work is done by the developer - in which case, why call it a subscription?

Can someone point me to some code that handles a subscription for an app - and what they had to do to set this up for recurring payments? Would greatly appreciate it....

many thanx.

peace. JOe...

Subscriptions in the iPhone SDK really are to get around the fact that you cannot sell virtual credits, therefore what you can do is sell a subscription and make the digital content free from within your application assuming the user has a subscription to your service, you are correct in that you have to handle the majority of the logic yourself