Which plan includes the In-App Purchases plugin, and what does it cost for a small app?

Hello Median team,

We have a finance app (web app wrapped with Median, iOS and Android) that sells a monthly subscription. Right now iOS users subscribe on our website via Stripe, and the iOS app hides upgrade prompts. In case we need native Apple in-app purchase, could you help with three questions?

Q1. Which plan includes the In-App Purchases plugin? Your pricing page lists it among the premium native plugins but does not say which tier (Essential, Plus or Business). Is it available below Business?

Q2. If it needs Business, can you give an indicative price? The page says starting at $7,200 a year. Is that what a single small app would pay, or is it quoted per app?

Q3. How does a subscription bought in the app reach our own backend (receipt or server-notification data, or the JavaScript Bridge), so we can mark the user as Pro?

We are on the Free plan today. Thank you!