to implement a $3-$tiered REST$-$based shopping cart application. Each tier is implemented on a different laptop and the laptops communicate using WIFI.Your implementation should allow client devices to interact with the first tier only.A customer should be able to :$1.$ Add productsCustomers should be able to search or browse products on your website. All products should have an Add to Cart button. When a customer adds a product to their cart, they may not buy it right away, or at all. Sometimes customers use their cart for considering products $-$which leads us to step $2\mathrm{.}2.$ Review the cartCustomers should have the opportunity to review their cart before making their purchase. They might decide they don't want a particular item, or want a different quantity, size, or color. They should be able to make these adjustments seamlessly, without leaving the cart$\mathrm{.}3.$ Complete the purchaseYour shopping cart software should calculate and display the total amount.You can ignore shipping costs and limit payments to cash on delivery$\mathrm{.}4.$ Continue the shopping processOnce a sale is complete, customers can keep browsing the products.The application should allow the shop owner to update the products inventory including product descriptions and price information. The application should also implement concurrency control.Ask ChatGPT to explain main modules in the code. Capture the explanations and include them in your submission. Make sure you understand what you submitted because you will be asked to re$-$explain it in the assignment discussion.CompleteSubmission DiscussionQuestionAnsweringMarks out ofs$4$DescriptionThe submission should include all the source code files and the requested documents in which you present the explanation and refactoring of the source codeAn oral discussion will be scheduled with every group in which they present two successful demos $[1)$ REST $2)$ GraphQL$/$gRPC$]$ and accurately answer the questions of the instructor.