Glossary entry

API versioning

API versioning is a method of evolving an API without breaking existing clients by running multiple compatible versions in parallel.

Category

Lending technology

Definition

Common approaches

Version in the URL (e.g. /v1/)
Version in headers
Backward-compatible schema evolution

Why it matters in banking integrations

Supports long-lived integrations with controlled rollout
Reduces outage risk from breaking changes
Enables parallel migrations (old and new clients at once)

Related terms

Backward compatibility Breaking change RESTful API

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