Splunk Http Json Request

I had trouble figuring out the message format that Splunk expects when you won't to post a message to exposed http event collector,
so there it is for future references since I will forget about it 100%

URL: http://localhost:8088/services/collector/event
headers:
 - Authorization = Splunk {your_token}
 - Content-Type  = application/json
json payload:

{
    "source" : "Postman",
    -- If there is nothing really specific having this value as '_json' should be prefered since it is one of Splunk standard source types
    "sourcetype" : "PostmanLog",
    -- Index must exsist!
    "index" : "postman",
    "event": {
        -- These are custom properties.
        "level": "Error",
        "message": "Splunk error from Postman."
    }
}