commiting the code after making the changes for backend

src/main/java/com/altimetrik/poc/controller/ShoppingCartController.java

+package com.altimetrik.poc.controller;
+
+import com.altimetrik.poc.dto.ProductDetails;
+import com.altimetrik.poc.services.ShoppingCartServices;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+
+@RequestMapping("api/v1")
+public class ShoppingCartController {
+
+    @Autowired
+    ShoppingCartServices shoppingCartServices;
+
+    @GetMapping("/getProducts")
+    public ResponseEntity<List<ProductDetails>> getProducts(){
+      List<ProductDetails> products  = shoppingCartServices.getProducts();
+
+      return ResponseEntity.ok(products);
+
+    }
+
+    @DeleteMapping("/removeProducts")
+    public void removeProducts(@RequestBody ProductDetails p){
+        shoppingCartServices.removeProducts(p);
+
+    }
+
+    @PostMapping ("/addProducts")
+    @CrossOrigin(origins="http://localhost:3000")
+    public void addProducts(@RequestBody ProductDetails p){
+
+        shoppingCartServices.addProducts(p);
+
+    }
+    @PutMapping("/updateProducts")
+    public void updateProducts(@RequestBody ProductDetails p){
+        shoppingCartServices.updateProduct(p);
+
+    }
+}

src/main/java/com/altimetrik/poc/dto/Customers.java

+package com.altimetrik.poc.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class Customers {
+
+        private Integer id;
+        private String email;
+        private  String password;
+}
\ No newline at end of file

src/main/java/com/altimetrik/poc/dto/ProductDetails.java

+package com.altimetrik.poc.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class ProductDetails {
+    private Integer orderNumber;
+    private Integer taxPrice;
+    private Integer shippingPrice;
+    private Integer totalPrice;
+    private Integer itemsPrice;
+    private Integer[] productIds;
+
+
+}

src/main/java/com/altimetrik/poc/services/ShoppingCartServices.java

+package com.altimetrik.poc.services;
+
+import com.altimetrik.poc.dto.ProductDetails;
+
+
+import java.util.List;
+
+public interface ShoppingCartServices {
+    public List<ProductDetails> getProducts();
+
+    public void addProducts(ProductDetails p);
+
+    public void removeProducts(ProductDetails p);
+
+    public void updateProduct(ProductDetails p);
+
+}

src/main/java/com/altimetrik/poc/services/ShoppingCartServicesImpl.java

+package com.altimetrik.poc.services;
+
+import com.altimetrik.poc.dto.ProductDetails;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class ShoppingCartServicesImpl implements ShoppingCartServices{
+
+    List<ProductDetails> product = new ArrayList<>();
+
+    public List<ProductDetails> getProducts(){
+        return product;
+    }
+
+    public void addProducts(ProductDetails p){
+
+        product.add(p);
+    }
+
+    public void removeProducts(ProductDetails p){
+        product.remove(p);
+    }
+
+    public void updateProduct(ProductDetails p){
+        product.remove(p);
+    }
+
+
+}