In this post, I try to describe what OAuth authentication is, how to do it, and why it is needed. This is a translation of a post of mine originally written in Japanese, and based on and following the flow described in a documentation written by @rmccue, the author WP REST API – OAuth 1.0a Server plugin, and the API.  OAuth1/Auth-Flow.md at master · WP-API/OAuth1 · GitHub Paw – The ultimate REST client for Mac: this is the app I’m using to build requests easily. When you find something wrong, I’m happy to get feedbacks as comments or reply to @shinichiN on twitter. Step 0. Getting Client Key and Client Secret from…