How did your service work? Did it accept REST, perform some actions, and send REST responses?

Yes, the service operated as a REST API: it accepted HTTP requests with REST patterns, processed data, and returned responses in JSON format. For example, a client would send a POST request with data, the service would validate it, perform business logic, and return the result via an HTTP response with the appropriate status and body.

Example in Java using Spring Boot:

@RestController
@RequestMapping("/api/items")
public class ItemController {

    @PostMapping
    public ResponseEntity<Item> createItem(@RequestBody Item item) {
        // processing and saving
        Item savedItem = itemService.save(item);
        return ResponseEntity.status(HttpStatus.CREATED).body(savedItem);
    }

    @GetMapping("/{id}")
    public ResponseEntity<Item> getItem(@PathVariable Long id) {
        Item item = itemService.findById(id);
        if (item == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok(item);
    }
}

Thus, the service accepted REST requests, performed operations, and sent REST responses to the client.