Multi-Line Push Bullet Notification from PowerShell. Associated blogpost https://blog.darrenjrobinson.com/accessing-your-ubiquiti-unifi-network-configuration-with-powershell/

Send-PushNotification.ps1

 # My Push Bullet Access Token
    # Created via Profile Page https://www.pushbullet.com/#settings/account 
    $pbAccessToken = 'yourPushBulletAccessToken'

    # Push Bullet API URI
    $pbApiURI = "https://api.pushbullet.com/"
    # Web Request Header
    $pbHeader = @{"Access-Token" = $pbAccessToken
        'Content-Type'           = "application/json"
    }

    # Format for Push Notification
    $pbBodyStatus = $null 
    foreach ($user in $uClientStatus) {
        if ($user.homeSince) {
            $pbBodyStatus += "$($user.hostname) $($user.status) \nLast Seen: $($user.lastHome) \nHome Since: $($user.homeSince) \n\n"    
        }
        else {
            $pbBodyStatus += "$($user.hostname) $($user.status) \nLast Seen: $($user.lastHome) \n\n"        
        }
    }

    $pbBody = @{"type" = "note"
        "title"        = "Who's Home and Away"
        "body"         = $pbBodyStatus
    }

    # Send Push Bullet Notification 
    try {
        $pbNotification = Invoke-RestMethod -Method Post -Headers $pbHeader -Uri ($pbApiURI + "v2/pushes") -Body ($pbBody | convertto-json).Replace('\\n', '\n')
        if ($pbNotification.active = $true) {
            write-host -ForegroundColor Green "Push Bullet Notification successfully sent"
        } 
    }
    catch {
        write-host -ForegroundColor Red "Push Bullet Notification Failed to Send"
    }