Change the way to read an item in a certain shopping cart

[TimothyXu]

As a system administrator I need a nested API So that our micro service can be used intuitively per RESTful principles

Details and Assumptions

• Use GET /shopcarts/{customer_id}/items/{item_id}

  Acceptance Criteria

  Given valid customer_id
  And that shopcart has item with id {item_id} in it
  When we call GET on /shopcarts/{customer_id}/items/{item_id}
  Then service returns code 200 OK
  And service returns message {item_id, name, price, quantity}