diff --git a/pom.xml b/pom.xml
index 76d8a50..0fd76f0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
@@ -20,7 +21,9 @@
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-web</artifactId>
+			<artifactId>spring-boot-devtools</artifactId>
+			<scope>runtime</scope>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
@@ -30,6 +33,15 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-validation</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<!-- <dependency>
 			<groupId>com.h2database</groupId>
 			<artifactId>h2</artifactId>
@@ -39,21 +51,10 @@
 			<groupId>org.postgresql</groupId>
 			<artifactId>postgresql</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-devtools</artifactId>
-			<scope>runtime</scope>
-			<optional>true</optional>
-		</dependency>
 		<dependency>
 			<groupId>org.projectlombok</groupId>
 			<artifactId>lombok</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
-			<scope>test</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>
 			<artifactId>junit-jupiter-api</artifactId>
@@ -98,4 +99,4 @@
 			</plugins>
 		</pluginManagement>
 	</build>
-</project>
+</project>
\ No newline at end of file
diff --git a/src/main/java/sg/com/smartinventory/serviceImpls/CustomerServiceImpl.java b/src/main/java/sg/com/smartinventory/serviceImpls/CustomerServiceImpl.java
index 7ff203e..f5e469d 100644
--- a/src/main/java/sg/com/smartinventory/serviceImpls/CustomerServiceImpl.java
+++ b/src/main/java/sg/com/smartinventory/serviceImpls/CustomerServiceImpl.java
@@ -1,5 +1,8 @@
 package sg.com.smartinventory.serviceImpls;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.stereotype.Service;
 
 import sg.com.smartinventory.entities.Customer;
@@ -24,6 +27,51 @@ public Customer createCustomer(Customer customer) {
         return newCustomer;
     }
 
+    @Override
+    public Customer getCustomer(long id) {
+        // Optional<Customer> optionalCustomer = customerRepository.findById(id);
+        // if(optionalCustomer.isPresent()) {
+        // Customer foundCustomer = optionalCustomer.get();
+        // return foundCustomer;
+        // }
+        // throw new CustomerNotFoundException(id);
+        // return customerRepository.findById(id).orElseThrow(() -> new
+        // CustomerNotFoundException(id));
+        return customerRepository.findById(id).get(0);
+    }
+
+    @Override
+    public ArrayList<Customer> getAllCustomers() {
+        List<Customer> allCustomers = customerRepository.findAll();
+        return (ArrayList<Customer>) allCustomers;
+    }
+
+    @Override
+    public Customer updateCustomer(long id, Customer customer) {
+        // Retrieve the customer from the database.
+        // Customer customerToUpdate = customerRepository.findById(id).orElseThrow(() ->
+        // new
+        // CustomerNotFoundException(id));
+        Customer customerToUpdate = customerRepository.findById(id).get(0);
+
+        // Update the customer retrieved from the database.
+        customerToUpdate.setFirstName(customer.getFirstName());
+        customerToUpdate.setLastName(customer.getLastName());
+        customerToUpdate.setCountry(customer.getCountry());
+        customerToUpdate.setAddress(customer.getAddress());
+        customerToUpdate.setPostalCode(customer.getPostalCode());
+        customerToUpdate.setPhoneNumber(customer.getPhoneNumber());
+        customerToUpdate.setEmail(customer.getEmail());
+
+        // Save the updated customer back to the database.
+        return customerRepository.save(customerToUpdate);
+    }
+
+    @Override
+    public void deleteCustomer(long id) {
+        customerRepository.deleteById(id);
+    }
+
     // @Override
     // public Review addReviewToCustomer(long customerId, long productId, Review
     // review) {
diff --git a/src/main/java/sg/com/smartinventory/serviceImpls/ProductServiceImpl.java b/src/main/java/sg/com/smartinventory/serviceImpls/ProductServiceImpl.java
index aa6eef9..a18727f 100644
--- a/src/main/java/sg/com/smartinventory/serviceImpls/ProductServiceImpl.java
+++ b/src/main/java/sg/com/smartinventory/serviceImpls/ProductServiceImpl.java
@@ -1,8 +1,12 @@
 package sg.com.smartinventory.serviceImpls;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.stereotype.Service;
 
 import sg.com.smartinventory.entities.Product;
+// import sg.com.smartinventory.exceptions.ProductNotFoundException;
 import sg.com.smartinventory.repositories.ProductRepository;
 import sg.com.smartinventory.services.ProductService;
 
@@ -21,4 +25,47 @@ public Product createProduct(Product product) {
 
         return newProduct;
     }
+
+    @Override
+    public Product getProduct(long id) {
+        // Optional<Product> optionalProduct = productRepository.findById(id);
+        // if(optionalProduct.isPresent()) {
+        // Product foundProduct = optionalProduct.get();
+        // return foundProduct;
+        // }
+        // throw new ProductNotFoundException(id);
+        // return productRepository.findById(id).orElseThrow(() -> new
+        // ProductNotFoundException(id));
+        return productRepository.findById(id).get(0);
+    }
+
+    @Override
+    public ArrayList<Product> getAllProducts() {
+        List<Product> allProducts = productRepository.findAll();
+        return (ArrayList<Product>) allProducts;
+    }
+
+    @Override
+    public Product updateProduct(long id, Product product) {
+        // Retrieve the product from the database.
+        // Product productToUpdate = productRepository.findById(id).orElseThrow(() ->
+        // new
+        // ProductNotFoundException(id));
+        Product productToUpdate = productRepository.findById(id).get(0);
+
+        // Update the product retrieved from the database.
+        productToUpdate.setCategory(product.getCategory());
+        productToUpdate.setName(product.getName());
+        productToUpdate.setDescription(product.getDescription());
+        productToUpdate.setPrice(product.getPrice());
+        productToUpdate.setStockQuantity(product.getStockQuantity());
+
+        // Save the updated product back to the database.
+        return productRepository.save(productToUpdate);
+    }
+
+    @Override
+    public void deleteProduct(long id) {
+        productRepository.deleteById(id);
+    }
 }
\ No newline at end of file
diff --git a/src/main/java/sg/com/smartinventory/services/CustomerService.java b/src/main/java/sg/com/smartinventory/services/CustomerService.java
index c8d6e2a..38c7bae 100644
--- a/src/main/java/sg/com/smartinventory/services/CustomerService.java
+++ b/src/main/java/sg/com/smartinventory/services/CustomerService.java
@@ -1,10 +1,20 @@
 package sg.com.smartinventory.services;
 
+import java.util.ArrayList;
+
 import sg.com.smartinventory.entities.Customer;
 // import sg.com.smartinventory.entities.Review;
 
 public interface CustomerService {
     Customer createCustomer(Customer customer);
 
+    Customer getCustomer(long id);
+
+    ArrayList<Customer> getAllCustomers();
+
+    Customer updateCustomer(long id, Customer customer);
+
+    void deleteCustomer(long id);
+
     // Review addReviewToCustomer(long customerId, long productId, Review review);
 }
\ No newline at end of file
diff --git a/src/main/java/sg/com/smartinventory/services/ProductService.java b/src/main/java/sg/com/smartinventory/services/ProductService.java
index d55ae43..ad915be 100644
--- a/src/main/java/sg/com/smartinventory/services/ProductService.java
+++ b/src/main/java/sg/com/smartinventory/services/ProductService.java
@@ -1,7 +1,17 @@
 package sg.com.smartinventory.services;
 
+import java.util.ArrayList;
+
 import sg.com.smartinventory.entities.Product;
 
 public interface ProductService {
     Product createProduct(Product product);
+
+    Product getProduct(long id);
+
+    ArrayList<Product> getAllProducts();
+
+    Product updateProduct(long id, Product product);
+
+    void deleteProduct(long id);
 }
\ No newline at end of file