to checkout a single item userid is required

src/main/java/com/webtutsplus/ecommerce/controller/OrderController.java

@@ -18,6 +18,7 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
+import springfox.documentation.spring.web.json.Json;
 
 import java.util.*;
 
@@ -45,14 +46,23 @@ public ResponseEntity<List<Order>> getAllOrders(@RequestParam("token") String to
         authenticationService.authenticate(token);
         int userId = authenticationService.getUser(token).getId();
         List<Order> orderDtoList = orderService.listOrders(userId);
-        return new ResponseEntity<List<Order>>(orderDtoList,HttpStatus.OK);
+        return new ResponseEntity<List<Order>>(orderDtoList, HttpStatus.OK);
     }
 
     @PostMapping("/create-checkout-session")
     public ResponseEntity<StripeResponse> checkoutList(@RequestBody List<CheckoutItemDto> checkoutItemDtoList) throws StripeException {
         Session session = orderService.createSession(checkoutItemDtoList);
         StripeResponse stripeResponse = new StripeResponse(session.getId());
-        return new ResponseEntity<StripeResponse>(stripeResponse,HttpStatus.OK);
+        return new ResponseEntity<StripeResponse>(stripeResponse, HttpStatus.OK);
+    }
+
+    @PostMapping("/checkout-single-product")
+    public ResponseEntity<StripeResponse> singleitemcheckout(@RequestBody CheckoutItemDto checkoutItemDto, @RequestParam String token) throws StripeException, NullPointerException {
+        int id = authenticationService.getUser(token).getId();
+        checkoutItemDto.setUserId(id);
+        Session session = orderService.createSessionforSingleItem(checkoutItemDto);
+        StripeResponse stripeResponse = new StripeResponse(session.getId());
+        return new ResponseEntity<StripeResponse>(stripeResponse, HttpStatus.OK);
     }
 
 }

src/main/java/com/webtutsplus/ecommerce/controller/UserController.java

@@ -1,6 +1,5 @@
 package com.webtutsplus.ecommerce.controller;
 
-
 import com.webtutsplus.ecommerce.dto.*;
 import com.webtutsplus.ecommerce.dto.user.SignInDto;
 import com.webtutsplus.ecommerce.dto.user.SignInResponseDto;
@@ -12,12 +11,14 @@
 import com.webtutsplus.ecommerce.service.AuthenticationService;
 import com.webtutsplus.ecommerce.service.UserService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
-@RequestMapping("user")
 @CrossOrigin(origins = "*", allowedHeaders = "*")
+@RequestMapping("user")
 @RestController
 public class UserController {
 
@@ -46,7 +47,6 @@ public ResponseDto Signup(@RequestBody SignupDto signupDto) throws CustomExcepti
     public SignInResponseDto Signup(@RequestBody SignInDto signInDto) throws CustomException {
         return userService.signIn(signInDto);
     }
-
 //    @PostMapping("/updateUser")
 //    public ResponseDto updateUser(@RequestParam("token") String token, @RequestBody UserUpdateDto userUpdateDto) {
 //        authenticationService.authenticate(token);

src/main/java/com/webtutsplus/ecommerce/service/OrderService.java

@@ -119,6 +119,26 @@ public Session createSession(List<CheckoutItemDto> checkoutItemDtoList) throws S
                 .build();
         return Session.create(params);
     }
+    public Session createSessionforSingleItem (CheckoutItemDto checkoutItemDto) throws StripeException {
+
+        String successURL = baseURL + "payment/success";
+        String failedURL = baseURL + "payment/failed";
+
+        Stripe.apiKey = apiKey;
+
+        List<SessionCreateParams.LineItem> sessionItemsList = new ArrayList<SessionCreateParams.LineItem>();
+        sessionItemsList.add(createSessionLineItem(checkoutItemDto));
+
+        SessionCreateParams params = SessionCreateParams.builder()
+                .addPaymentMethodType(SessionCreateParams.PaymentMethodType.CARD)
+                .setMode(SessionCreateParams.Mode.PAYMENT)
+                .setCancelUrl(failedURL)
+                .addAllLineItem(sessionItemsList)
+                .setSuccessUrl(successURL)
+                .build();
+        return Session.create(params);
+    }
+
 }