How do I call API using postman for requesting token for large scale matrix routing in HERE API

I am not able to figure out the exact API request format in Postman for requesting token for large scale matrix routing in HERE API. Below is the official document page which is not clear of course. https://developer.here.com/documentation/large-matrix/dev_guide/topics/get-started/request-a-token.html Any pointers would be appreciated. Thank you.

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