API Versioning — Proposed Guide

API Versioning: Versioning provides a way to change contracts without silently changing a client expectation. The illustrative /v1 prefix groups a…

Overview

Versioning provides a way to change contracts without silently changing a client expectation. The illustrative /v1 prefix groups a proposed contract; it is not evidence that version one has launched.

Key concepts

Classify additive fields, removed fields and changed meanings separately. Clients should tolerate unknown optional response fields but should not guess the semantics of unknown states.

Implementation considerations

Before a migration, compare stored fixtures and explicit field meanings. Deprecation dates and compatibility windows are not established in this preview.

Proposed API behavior

GET /v1/expenses/exp_example_123 is an illustrative design for this topic. Path and field names may change before implementation. Access would require an authorized organization context and operation-specific permission; no public API or authorization grant is available here.

No additional request fields are illustrated; this is not a finalized contract.

Static example requests

# Proposed request text only; this reserved host is not a live API.
curl -X GET 'https://api.remizen.example/v1/expenses/exp_example_123' \
  -H 'Authorization: Bearer YOUR_API_KEY'

Fictional response example

{
  "data": [
    {
      "expense_id": "exp_example_123",
      "version": 1,
      "id": "exp_example_123",
      "organization_id": "org_example_123",
      "merchant": "Example Office Supply",
      "amount_minor": 12550,
      "currency": "USD",
      "status": "draft"
    }
  ],
  "pagination": {
    "has_more": false,
    "next_cursor": null
  },
  "meta": {
    "request_id": "req_example_123",
    "reference_only": true
  }
}

Illustrative error case

Review this failure case in context: Before a migration, compare stored fixtures and explicit field meanings. Deprecation dates and compatibility windows are not established in this preview.

{
  "error": {
    "code": "validation_error",
    "message": "The proposed api versioning operation requires review of its input or authorization.",
    "request_id": "req_example_123"
  }
}

Proposed data types

Related documentation