PowerShell Script to get Ubiquiti Unifi Sites, Devices and Active Clients. Associated blogpost https://blog.darrenjrobinson.com/accessing-your-ubiquiti-unifi-network-configuration-with-powershell/

Get-Unifi-Details.ps1

# Unifi Controller Login Base URI
$uController = 'yourControllerIP' # e.g 'https://192.168.1.2:8443'
# Identifier of the site in UniFi. Set to default for the default site
$uSiteID = "default"

$uUsername = 'adminuser' # yourAdmin UserID
$uPassword = 'yourPassword' # yourAdmin User Password
$uAuthBody = @{"username" = $uUsername; "password" = $uPassword }
$uHeaders = @{"Content-Type" = "application/json" }

# Allow connection with the Unifi Self Signed Cert
add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
    public bool CheckValidationResult(
        ServicePoint srvPoint, X509Certificate certificate,
        WebRequest request, int certificateProblem) {
        return true;
    }
}
"@
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Ssl3, [Net.SecurityProtocolType]::Tls, [Net.SecurityProtocolType]::Tls11, [Net.SecurityProtocolType]::Tls12

$uLogin = Invoke-RestMethod -Method Post -Uri "$($uController)/api/login" -Body ($uAuthBody | convertto-json) -Headers $uHeaders -SessionVariable UBNT

if ($uLogin.meta.rc.Equals("ok")) {
    Write-Host -ForegroundColor Green "Successfully authenticated to $($uController) as $($uUsername)"
        
    # Get Sites
    $uSites = Invoke-RestMethod -Method Get -Uri "$($uController)/api/self/sites" -WebSession $UBNT -Headers $uHeaders
    write-host -ForegroundColor Cyan "Sites"
    $uSites.data.name
    
    # Get Devices
    $uDevices = Invoke-RestMethod -Method Get -Uri "$($uController)/api/s/$($uSiteID)/stat/device" -WebSession $UBNT -Headers $uHeaders
    write-host -ForegroundColor cyan "Devices"
    $uDevices.data.name

    # Get Active Clients
    $uActiveClients = Invoke-RestMethod -Method Get -Uri "$($uController)/api/s/$($uSiteID)/stat/sta" -WebSession $UBNT -Headers $uHeaders
    write-host -ForegroundColor cyan "Active Clients"
    $uActiveClients.data.name
}
else {
    Write-Host -ForegroundColor Red "Unsuccessfull in authenticating to $($uController) as $($uUsername)"
}

This is awesome. Any idea how to authenticate if you have 2fa enabled?
When I run this script, I get the following error:

Invoke-RestMethod : {"meta":{"rc":"error","msg":"api.err.Ubic2faTokenRequired"},"data":[]}
At C:\Users\...\My Documents\Scripts\UniFi Automation\Get-Unifi-Details.ps1:26 char:11

That seems to indicate that there should be some way of passing the token to the endpoint, but nothing I've tried works.

I'm only prompted for 2FA when using the Unifi Public Endpoint, via http://unifi.ubnt.com/
When using the IP Address and Port of the local cloudkey from within the same local network 2FA isn't triggered.