Prompt

Design and implement API versioning for my service.

<current_api>
{describe current API structure}
</current_api>

<breaking_changes>
{planned breaking changes}
</breaking_changes>

<client_constraints>
{client update capabilities}
</client_constraints>

Implement:
1. Versioning scheme (URL/header/content-type)
2. Backward compatibility approach
3. Deprecation strategy
4. Client migration path
5. Documentation approach