Jetpack will allow you to authorize applications and services to securely connect to your blog and allow them to use your content in new ways and offer you new functionality.
Developers can use WordPress.com's OAuth2 authentication system and WordPress.com REST API to manage and access your site's content.
Questions & Answers
- Does this support custom post types and custom taxonomies?
You can follow the instructions in this post to add Custom Post Type and metadata support on your site. You can also learn more about the API by visiting the REST API documentation.