added basic strcture for the callbackapi

src/main/java/com/billpaymentservice/bbps/serviceImpl/AgentServiceImpl.java

@@ -368,7 +368,6 @@ public class AgentServiceImpl implements AgentService {
 			billFetchByBillIdRequest.setReqId(reqId);
 			LOGGER.info("Waiting for 2 seconds before fetching bill by ID...");
 			try {
-
 				Thread.sleep(12000);
 			} catch (InterruptedException e) {
 				Thread.currentThread().interrupt();
@@ -648,9 +647,53 @@ public class AgentServiceImpl implements AgentService {
 			throw new CustomException("Invalid JSON received from API");
 		}
 	}
+//================================== End Bill fetch and Bill Validate by Client Req Id==================================//
+//===================================Callback Methods BillFetch and BillValidate ==================================//
+	
+	@Override
+	public ResponseModel processBillFetchCallback(BillDataResponse billDataResponse) {
+          
+		LOGGER.info("Recived Call Back from billDataResponse: {}", billDataResponse);
+	     if(billDataResponse.getGenericResponse().getStatusCode().equals("200")) {
+	       
+	      }
+	     else {
+	    	 LOGGER.info("Bill Fetch Callback Failed with Status: {}", billDataResponse.getGenericResponse().getStatus());
+	    	 
+	     }
+	     
+	     return new ResponseModel("CallBack Recieved Successfully",
+	    			"200",
+	    			200,
+	    			"");
+         
+	}
+
+@Override
+public ResponseModel processBillValidateCallback(FetchBillValidateResponse billValidateResponse) {
+	LOGGER.info("Recived Call Back from FetchBillValidateResponse: {}", billValidateResponse);
+    if(billValidateResponse.getGenericResponse().getStatusCode().equals("200")) {
+      
+     }
+    else {
+   	 LOGGER.info("Bill Fetch Callback Failed with Status: {}", billValidateResponse.getGenericResponse().getStatus());
+   	 
+    }
+    
+    return new ResponseModel("CallBack Recieved Successfully",
+   			"200",
+   			200,
+   			"");
+	
+     
+}}
+
+
+
 
 
 	/*
+	 
 	 * @Override public ResponseModel
 	 * initiateBillValidate(FetchBillValidatestRequest fetchBillValidateRequest) {
 	 * 
@@ -838,4 +881,4 @@ public class AgentServiceImpl implements AgentService {
 	 */
 
 	
-}
+

src/main/java/com/billpaymentservice/bbps/serviceImpl/PaymentServiceImpl.java

@@ -398,6 +398,24 @@ public class PaymentServiceImpl implements PaymentService {
 	        throw new CustomException("Invalid JSON received from API");
 	    }
 	}
+
+	@Override
+	public ResponseModel handlePaymentIntiateCallback(TransactionStatusResponse transactionStatusResponse) {
+
+		LOGGER.info("Recived Call Back from FetchBillValidateResponse: {}", transactionStatusResponse);
+	    if(transactionStatusResponse.getGeneralResp().getStatusCode().equals("200")) {
+	      
+	     }
+	    else {
+	   	 LOGGER.info("Bill Fetch Callback Failed with Status: {}", transactionStatusResponse.getGeneralResp().getStatus());
+	   	 
+	    }
+	    
+	    return new ResponseModel("CallBack Recieved Successfully",
+	   			"200",
+	   			200,
+	   			"");
+	}
 }
 	/*  PollBack logic for the fetchTxnByTxnId API
 	 * @Override public ResponseModel fetchTxnByTxnId(BillFetchByBillIdRequest