I am trying to access my production F5 device via Postman. When sending a GET request "https://<URL>" getting 200 OK however when I'm trying to get pool details by sending GET request to "https://<URL>/mgmt/tm/ltm/pool" getting "401 F5 Authorization Required"
My understanding is that you have to authenticate to the BIG-IP system as an admin (or other user authorized to make API calls) before you can issue configuration commands. (Similarly to the way you have to log into the BIG-IP system in order to configure it.) There is a lab on F5 CloudDocs that has some examples of using Postman with BIG-IP, including how to authenticate. Hopefully that will give you what you need to get going.
BIG-IP programmability is a big topic, for which F5 provides a lot of training, much of which is free. For example, the link I sent you is part of a larger training course on BIG-IP programmability. You can access the base training contents here: https://clouddocs.f5.com/training/community/programmability/html/
If you haven't already done so, I suggest exploring the training pieces first to obtain a better understanding of the system's API and associated workflows before embarking on an actual configuration.
