Navigate to the following URL in your web browser: http(s)://host:port/EndevorService
The website displays the current API version of the server, for example: 18.00.001. Note the server version number, as you will need this when selecting the correct plug-in.
For Endevor V18.1, the API version also shows in Tomcat log, here is an example:
13:19:08.427 <main> INFO (c.c.e.c.SetupUtils) Endevor Webservice version: 2.5-20210506-FCE7B5B