POST Request information

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Hi,

Is there any proper guides for creating push notifications, I cannot get a POST request working and all information on urban airship seems too vague to follow. 

Can someone help me translate the code below to work with Postman. Ive added in 3 header fields of Accept application/vnd.urbanairship+json; version=3; Accept application/json & Authorization Basic <myappkey:mymasterkey>. Although I couldnt find the value required for "master authorization string" anywhere on this site. Am I using the correct value here?

I then have a simple json feed in the body of the request as raw data. The response I get is Unauthorized, with error code 40101.

POST /api/push HTTP/1.1
Authorization: Basic <master authorization string>
Content-Type: application/json
Accept: application/vnd.urbanairship+json; version=3;

{
    "audience": {
        "ios_channel": "9c36e8c7-5a73-47c0-9716-99fd3d4197d5"
    },
    "notification": {
        "alert": "Hello!"
    },
    "device_types": "all"
}