ios app

Hi, I'm building an iOS app (TradePulse IQ, Bundle ID: co.median.ios.rdlxqjo) using Median to wrap a web app built on Base44. Apple has rejected my app under Guideline 3.1.1 because I currently sell a subscription via Stripe, and Apple requires digital subscriptions to go through In-App Purchase (StoreKit) instead.
I understand Median has a native In-App Purchase plugin with a JavaScript bridge (median.iap). I have a few questions before I commit to this:

Does this feature require a paid Median plan/license? If so, which tier, and what's the cost?
Does the IAP plugin support auto-renewable subscriptions (not just one-time purchases)? My product is a £9.99/month subscription, plus a separate £0.50 one-time certificate purchase.
What's involved in setting this up on my end — do I just enable a toggle in the Median dashboard, or is there additional configuration needed (e.g., product IDs matching App Store Connect, entitlement setup, etc.)?
Do you have documentation or a step-by-step guide for connecting Median's IAP bridge to a Base44 (or similar low-code/web-based) app specifically, since my app developer (Base44) will need to write the frontend calls and backend receipt validation on their end?
Are there any known limitations or common pitfalls when using this with a WebView-wrapped app rather than a fully native app?

I'd like to understand feasibility and cost before starting the App Store Connect setup (Paid Applications Agreement, product creation, etc.) on my end. Thanks for your help.