API Design

Idempotency Key

A unique identifier sent with API requests to ensure that retried requests don't create duplicate side effects, commonly used in payment APIs.

Related Protocols

HTTP

Mentioned in Guides

Implementing Webhooks: A Complete Guide API Design & Best Practices

Designing Idempotent APIs: From Theory to Implementation API Design & Best Practices

Implementing Retry with Exponential Backoff Error Handling Patterns

Idempotency Keys for Safe API Retries Error Handling Patterns

Saga Pattern: Managing Distributed Transactions with Compensating Actions Error Handling Patterns

Related Scenarios

409 Conflict — Optimistic Locking Failure HTTP

See Also

Idempotency HTTP Concepts

Rate Limiting API Design

Bulk Operations API Design

Retry Strategy Error Handling