Governance

How to ensure API governance (advertise, consistency, …)

Agenzia per l'Italia Digital & Team per la trasformazione digital (Italian administration) - Interoperability model for the Public Administration

Catalog of API/Services
Model governance

Atlassian - Atlassian REST API Design Guidelines version 1

Using these Guidelines
We strongly recommend that someone who is familiar with these guidelines should review your REST API code
Version Control for APIs
When to Change the Version

Atlassian - Atlassian REST API Policy

Compatibility policy
Deprecation policy

Australian Digital Transformation Office - API Design Guide

Register your API

Haufe - Haufe API style guide

API Modelling and Design Process
API Design Review Process
Message Schema and Postel's Law

Microsoft - Microsoft REST API Guidelines

Interpreting The Guidelines
When to version
Definition of a breaking change

Zalando - RESTFul API Guidelines

API First
Deprecation
API Discovery

adidas - adidas API design guidelines

Version Control System
OpenAPI Specification
API Design Platform - Apiary
Testing
Rules For Extending