This is Java based, Spring Boot API. Steps to run the application.

1. Clone/Download the project and import it to Eclipse.

2. From Project Explorer

   1. Right-click on project name -> Maven -> Update Project.. -> Check offline && Force Update of Snapshots/Releases.
   2. Right-click on project name then click on Show in a local terminal.
   3. Run command mvn install -U -e to do maven package/install.
   4. Right-click on project name -> Run As -> Spring Boot App.

3. To the correct syntax for JSON input String, 1 Once the application will start running, Open postman and make a GET call with the URL "http://localhost:9090/orders" and remove the '[' & ']' square brackets from returned JSON String.

4. Now paste the example JSON string under Body (type JSON) of Postman and make a POST call to URL "http://localhost:9090/getOrders" for getting desired output (Total cost for your order).