Set Azure app service specific application settings (not web.config)

AzureSetAppSettings.ps1

<#
  .SYNOPSIS
  Set Azure app service specific application settings (not web.config)
  .DESCRIPTION
  Set Azure app service specific application settings (not web.config)
  .EXAMPLE
  AzureSetAppSettings -ResourceGroupName "cmc-scm-tst-us-e-rg" -WebAppName "888888sisclientweb01"
  .EXAMPLE
  AzureSetAppSettings -ResourceGroupName "cmc-scm-tst-us-e-rg" -WebAppName "888888sisclientweb01" -Slot "qa"
  .PARAMETER ResourceGroupName
  Resource group name
  .PARAMETER WebAppName
  Web app name
  .PARAMETER Slot
  Optional slot name
#>

[CmdletBinding()]
param(
    [Parameter(Mandatory=$True)]
    [string]
    $ResourceGroupName,
    [Parameter(Mandatory=$True)]
    [string]
    $WebAppName,
    [Parameter(Mandatory=$False)]
    [string]
    $Slot
)

$hash = @{}

if([string]::IsNullOrEmpty($Slot)) {
    Write-Host "Using standard (non-slot) deployment"
    $website = Get-AzureRmWebApp -Name $WebAppName -ResourceGroupName $ResourceGroupName
    $currentAppSettings = $website.SiteConfig.AppSettings

    ForEach ($kvp in $currentAppSettings) {
        $hash[$kvp.Name] = $kvp.Value
    }

    $hash['WEBSITE_LOAD_CERTIFICATES'] = "*"
    $hash['CertificateStoreLocation'] = "CurrentUser"

    Set-AzureRmWebApp -Name $WebAppName -ResourceGroupName $ResourceGroupName -AppSettings $hash
}
else {
    Write-Host "Using slot deployment"
    $website = Get-AzureRmWebAppSlot -Name $WebAppName -ResourceGroupName $ResourceGroupName -Slot $Slot
    $currentAppSettings = $website.SiteConfig.AppSettings
    
    ForEach ($kvp in $currentAppSettings) {
        $hash[$kvp.Name] = $kvp.Value
    }

    $hash['WEBSITE_LOAD_CERTIFICATES'] = "*"
    $hash['CertificateStoreLocation'] = "CurrentUser"
    Set-AzureRmWebAppSlot -Name $WebAppName -ResourceGroupName $ResourceGroupName -AppSettings $hash -Slot $Slot
}