Help Needed for REST Web Service

Hello Team,
I need assistance with the REST API:
I have a Splunk URI along with a Bearer token and Key, Value, etc.
By using POST MAN am able to performing POST requests and get the response.
I am unable to do POST method in AA 360, and there is no Bearer token available.

Can you please help me by outlining the steps to utilize a REST web service with a Token?