added requestBillFetch api

src/main/java/com/billpaymentservice/bbps/controller/AgentController.java

@@ -0,0 +1,36 @@
+package com.billpaymentservice.bbps.controller;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+import com.billpaymentservice.bbps.dto.ResponseModel;
+import com.billpaymentservice.bbps.dto.request.FetchBillRequest;
+import com.billpaymentservice.bbps.service.AgentService;
+
+@RestController
+@RequestMapping("/agent")
+public class AgentController {
+
+    private final AgentService agentService;
+
+    public AgentController(AgentService agentService) {
+        this.agentService = agentService;
+    }
+
+    /**
+     * Fetches bill details from external BBPS service
+     */
+    @PostMapping(
+        value = "/requestBillFetch",
+        consumes = MediaType.APPLICATION_JSON_VALUE,
+        produces = MediaType.APPLICATION_JSON_VALUE
+    )
+    public ResponseEntity<ResponseModel> requestBillFetch(
+            @Validated @RequestBody FetchBillRequest fetchBillRequest) {
+
+        ResponseModel response = agentService.initiateBillFetch(fetchBillRequest);
+        return ResponseEntity.ok(response);
+    }
+}