Api Compatv1.0.0

A SaaS company needs to deprecate an old v1 API endpoint while supporting mobile apps that take months to update. They use additive changes first, then communicate a sunset date with response headers like Sunset and Deprecation, and gate removal on usage metrics.

An e-commerce platform is sunsetting a legacy 'category_id' field in favor of a new 'category_slug' field. They add the new field as nullable and optional, track callers of the old field via logging, and only remove after a 6-month deprecation window and no traffic.

A mobile API provider must change authentication from API key to OAuth2 without breaking existing mobile clients. They introduce OAuth2 as an alternative, keep the old key method alive for 12 months, and coordinate releases with app store updates.

An analytics company switches from offset-based pagination to cursor-based pagination to improve performance. They add cursor pagination as an option, maintain the old offset mechanism, and migrate clients over 3 months with detailed migration docs.

Companies charge per API call or subscription. API compatibility ensures clients stay on supported versions without breaking, reducing churn and support tickets.

Platforms like Shopify or Salesforce allow third-party integrations. Maintaining API compatibility encourages app developers to build on the platform, increasing stickiness and ecosystem value.

Enterprise contracts include uptime and non-breaking change guarantees. API compatibility enables smooth upgrades, justifying higher price tiers and longer commitments.