My project is organized in layers like

• Configuration
• Controller
• Service
• Repository
• Domain

Our REST Controller is in the Controller layer. We need to connect to another API via REST calls and I'm not sure if I should make a new Controller or do it in the Service layer.

I'm going to implement the REST calls with Spring's RestTemplate.

The way our API will be used is like this:

• REST call is made that goes through our REST endpoint.
• Our REST endpoint will call the third party API (either by calling another controller method or a service method).
• We will then do a conversion between our format and the third party format
• Then we will return the JSON of our format back to the client