Challenge 2: Automate a Chained Variable — Possible Solution
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const body = pm.response.json();
pm.environment.set("orderId", body.id);

WHY THIS WORKS AS AN ANSWER
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This is the exact same pattern as the chapter's own login-token
automation example: parse the response body with pm.response.json(),
then immediately store the specific field needed (here, id, rather
than token) into the environment with pm.environment.set().

Once this line runs as part of the "Create Order" request's Test
script, every subsequent request in the collection can reference
{{orderId}} directly — for example, a "Get Order Status" request's URL
becoming {{baseUrl}}/orders/{{orderId}} — with no manual "Set as
variable" click needed, and the value refreshing automatically every
time a new order is created and this script runs again.