Adding Subscriptions to Windows Phone app as an in-app purchase -

from understanding, windows phone allows in-app purchases. empower users signup one-of-three subscription levels within app. however, not understand how enable type of scenario. see option add "in-app product". however, in case, i'm not sure of following:

• am offering 1 product or 3 separate products (one each subscription level).
• i don't understand "product identifier" identifier subscription or identifier of app? if former, shouldn't toss guid in here?

thank you,

it may worth taking @ the overview on msdn - product identifier 1 submit (as person) via development dashboard - it's 1 app can enumerate see list of available products, , product id you'd use purchase.

as far i'm aware, cannot have products (for example) £10 per month though - of course have bundles on pricing structure exchange within app, maybe £5 5 music downloads, £9 10 etc. rather "a £10 per month unlimited" (difficult give generic example though)