How should Stripe deprecate APIs?

1. Remove from future API versions

2. Identify customers still using old API

3. Identify the active customers still conducting business

4. Send the active customers a migration strategy advising they update this year

5. 3 months later, set a deadline of 6 months to update

6. Send frequent reminders as deadline approaches

7. Put a 'wall' in the dashboard requiring remaining customers update before they can enter reports etc

8. 3 months later remove deprecated API and freeze accounts still using them