Google Play Billing v8 migration: what actually changes (and what to fix before v9)
A credited summary of RevenueCat’s practical migration guide for Play Billing Library v8: what APIs changed, what teams commonly miss, and how to avoid a last-minute scramble when v9 lands.
Original article (source): RevenueCat - “A complete guide to migrating from Google Play Billing v7 to v8 (and preparing for v9)” (published May 8, 2026)
What changed (in plain English)
RevenueCat’s guide is useful because it is not “update the dependency and pray”. It breaks the v7 to v8 move into the parts that tend to bite teams:
- Removed / replaced APIs (you cannot just keep calling the old surface).
- Connection and query changes (what you fetch, when you fetch it, and how you handle responses).
- Purchase flow behavior shifts (edge cases that only show up in production).
If you ship a subscription app on Android, this is one of those migrations where “we will deal with it later” quietly becomes a risk item.
The operational takeaway: treat billing as a product surface
Billing migrations are rarely “just engineering”. They touch:
- checkout reliability,
- entitlement accuracy,
- refund / cancellation handling,
- analytics parity (before vs after the migration), and
- support load when things misfire.
A good way to approach it is like a feature launch: timebox the migration, add instrumentation, and write a rollback plan.
Tiny win
Before you change anything, capture a baseline:
- top 5 purchase errors (by count) over the last 14 days,
- trial start to paid conversion rate,
- “missing entitlement” support tickets.
Then re-check the same three after the v8 rollout. If they drift, you will know quickly.
Read the original: https://www.revenuecat.com/blog/engineering/play-billing-8-migration/
Want help with ASO?
If you want this implemented for your app, check out our services - or run your workflow in APPlyzer.