Accessing F5 via Postman

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.