Contract versioning

Contract versioning

When the API is actively developing, it is important to maintain compatibility between versions and avoid situations where one change breaks dozens of client integrations. We implement a full-fledged contract versioning that allows you to control changes and smoothly update APIs without risk to users.

This is critical in microservice architecture, B2B integrations, and open API products where different clients use different versions of interfaces.

What We Are Versioning

Object	Description
OpenAPI specifications	Keep every version of documentation and contract
Endpoints	Add versions to the URL ('/v1/', '/v2/'), save backward compatibility
Pact, Dredd	Fix Client-Server Terms
Data Models	Change Control in Request and Response Structure

How we implement

Support for multiple API versions in parallel
Explicit versioning in URLs, headers, or parameters
Autotesting of each contract version (Pact, Postman, Jest, Dredd)
Versioning specifications in Git or via CI/CD
Documentation and changelog for customers on each change

Advantages

Guaranteed stability of integrations
The ability to release new features without the risk of "breaking" customers
Simplify migration between versions
Clear change history and contract control
Transparency for external and internal development teams

Where especially important

Multi-dependency microservice architecture
Public or B2B API platforms
Financial and payment systems with long-term contracts
Mobile apps that depend on a stable API

Contract versioning is the foundation of predictability and trust in APIs. We implement processes that allow you to change and develop APIs without pain, while maintaining compatibility and transparency for all parties.