Generating Authentication Token Using Windows PowerShell script

I believe this is what you are looking for :

$Credential = Get-Credential
$Token = Get-MgmtSvcToken -Type Windows -AuthenticationSite "https://Computer01:30072" -ClientRealm "http://azureservices/AdminSite" -User $Credential -DisableCertificateValidation

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reference : https://docs.microsoft.com/en-us/powershell/module/mgmtsvcadmin/get-mgmtsvctoken?view=azurepack-ps

You can also try it like this :

The following method allows you to create the token and then post it to an API.


reference : https://vss-wiki.eis.utoronto.ca/display/API/How+to+generate+an+access+token+using+PowerShell

There isn't really any generic method for this.  The information and syntax that you will have to supply in the web request will vary depending on the design of the API, and as such the API documentation is a must to proceed.  Anything I provide here is only an example of how things might be used.

Here's a sample showing how I had to do something similar for a particular environment.

# Define a base part of the URL (useful when there may be different environments, e.g. sandbox and production)
$restURLbase = "https://restapi.somedomain.com"

# Get an access token for later calls
$authBody = @{
    grant_type = 'password'
    username = 'someuser'
    password = 's0mePa$s'
    }
$authURL = "$restURLbase/authorization"
$auth = Invoke-RestMethod -Uri $authURL -Method Post -Body $authBody

# Make a request using the access token
$headers = @{
    Authorization = "$($auth.tokenType) $($auth.accessToken)"
    }
$restURL = "$restURLbase/something/blah"
$data = Invoke-RestMethod -Uri $restURL -ContentType 'application/json' -Method Get -Headers $headers

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Footech,
This is all that I have been given by the API owner:

https://api.xxx.com/xxx/authenticate

Post below request to above URI
{
  "username":"oldenkamp",
  "password":"<password>"
}
Above request will get you Response as below:
{
    "status": "success",
    "id_token": "eyJraWQiOiJuZjlzTzhaeENtbXVCNVF2eFJ0eXE4cU55RGF2OGF2VTBvaWJQeVllcDZvPSIsImFsZyI6IlJTMjU2In0.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.OiRtt_zUlxM6aQAll6rL4zUI10L1ZOJT4-XXhxjpuf9TbJUj0En55yu2QoFXepC5hBQgoFHCxLcvgae057e9H9wL4ylve4GHwSYTj_2ue0nblLrELrtS0b30r3MjIZV5I9L7Z2H2166FDreYW0QBZYcbJ6LHpo2GrkWBWGzgZ6p-AIoEL4sz5KyFMoMAclhG9uYAmwPX2Jnv62CMgbKtgjdqtdGSa6eNwlv-GtFoew4QIIvNdfQQ2Cegm4nPw024_xKqBvcgenkLkEYzwdNcQEf1lj9fYnk-szUtpiw6gPaU61jyvFdydGSw0TKmEUhV40QK21OiOiS50NTtlfpD2Q"
}


They are expecting it via Postman, but I am trying to automate it via Powershell.

Footech, your example got me close enough to produce a result. I did have to make small modifications to fit the API, but it was a good example. Thanks to all for the help.