We could call it a guide to why Umbraco dont understand the term Gateway... but that would be harsh.
Get Email Template By Template Name from Umbraco via /Base and content service Setting content service so that its available within the application from ANYWHERE that can access the application.
Simple Example (So you'd need to clean your own shit up in the Rest Controller)
The URL would be
http://www.xxxx.local.dev/base/EmailTemplateHelpers/GetEmailTemplate/Email%20Standards