CASE 1
The sweeping Concurrent Agreements change
Not a feature addition — a change to the agreement identifier itself.
- The agreement identifier moved to LicenseArn. The one-account-one-agreement assumption broke, forcing DB schema changes
- ResolveCustomer / GetEntitlements responses changed, requiring per-LicenseArn agreement tracking
- Notifications had to migrate from Amazon SNS to Amazon EventBridge
Already supported. No code changes on your side.