New Features
- Custom Store Products — Attach products from a custom store like Stripe or your own payment backend to Android paywalls; their price, period and trial are pulled from Superwall and purchases route through your own `PurchaseController` instead of Google Play.
Improvements
- Android SDK 2.8.0 — Moves to Google Play Billing Library 9 (minimum Android version is now 6.0 / API 23) and forwards the system back press into the paywall so multi-page paywalls navigate back a page instead of dismissing.