AADSCConfigContent.psm1

function Get-AADSCConfigContent {
    param(
        [Parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
        [String]
        $ResourceGroup,
        [Parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
        [String]
        $AutomationAccount,
        [Parameter(Mandatory=$true,ValueFromPipelineByPropertyName=$true)]
        [String]
        $Configuration
    )
    # Get Auth token using classes registered by Az.Accounts module
    # Used in many Azure API examples such as: https://docs.microsoft.com/en-us/azure/governance/resource-graph/first-query-rest-api#rest-api-and-powershell
    $azContext = Get-AzContext
    $azProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
    $profileClient = New-Object -TypeName Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient -ArgumentList ($azProfile)
    $token = $profileClient.AcquireAccessToken($azContext.Subscription.TenantId)
    $authHeader = @{
        'Content-Type'='application/json'
        'Authorization'='Bearer ' + $token.AccessToken
    }

    # API spec: https://github.com/Azure/azure-rest-api-specs/tree/master/specification/automation/resource-manager/Microsoft.Automation/stable/2019-06-01
    $apiVersion = '2019-06-01'
    # Documented: https://docs.microsoft.com/en-us/rest/api/automation/dsc-configuration/get-content
    $restUri = "https://management.azure.com/subscriptions/$($azContext.Subscription)/resourceGroups/$ResourceGroup/providers/Microsoft.Automation/automationAccounts/$AutomationAccount/configurations/$Configuration/content?api-version=$apiVersion"
    Invoke-RestMethod -Uri $restUri -Method Get -Headers $authHeader
}