Where/ How to obtain Stream Reader

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I am very much a novice to API’s and a lot of the terminology here seems as though it’s a foreign language to me.

I am attempting to obtain inventory amounts of items from a company I work with and they have informed me to use the API. I used a Get request and received the 200 response for my request. However, I was advised to obtain a stream reader to, “pull the response stream”. Their API sends back a serialized inventory object in JSON format.

Does anyone here have any knowledge of how I could do that using Postman or will I need 3rd party software etc?