记录一个在 SO 上发的一个自问自答
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Let's say I want to create a new obj called 'qif' then get its id, and then update it.

1. In Postman open the first request - Test tab enter:

var jsonData = JSON.parse(responseBody);
pm.environment.set("new_create_qif_id", jsonData.id);

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2. after sending the request you will get the environment valuable new_create_qif_id ready.

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3. use {{new_create_qif_id}} in request body or URL, it will be updated every time we run the collection or folder

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Requesting token is just the same.