a simple REST-api that calculates products final price

this api recieves a bunch of products that are available inside our database
and responses final payable price that user must pay(considering off)
amd also lists the products in user's basket

imagine we have a very simple table in our database:

we'll have these two requests as below:

by sending localhost:8080/goods,
if you're using postman send this request:

then you'll receive all products inside database in json format:

by sending localhost:8080/buy,
if you're using postman send this request(as an example):

(the numbers inside the slice are ids of products)
then you'll receive final price and all selected products:

after installing the commands, you should run shoppingServer start as below to run the server:

then you can send requests mentioned above :)
you can intrrupt the server by usingctrl + C
NOTE: this CLI app is tested inside jetbrains goland