REST API specification
Easy Redmine support REST API in most of its entities => it is integrable with any application that also supports REST API. This article is about where you can find REST API specification directly in your Easy Redmine.
General information about Easy Swagger
API specification/documentation is a part of every application (from 10.14 LTS and all higher versions).
You can find it under URL [my_application_url]/easy_swagger
It is an interactive tool, which also allows testing every command with real data => BE VERY CAREFUL WHEN TESTING ON PRODUCTION DATA. In fact, avoid it if possible.
If the URL /easy_swagger does not work (404), go to Administration >> Plugins >> Find Swagger - Edit.
Make sure the feature is activated.