PowerShell snippet to login to Sitecore using Invoke-WebRequest

SitecoreWebRequestLogin.ps1

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

$url = 'https://sitecore-cm.domain.com/sitecore/login'
$password = 'yourpasseordhere'

$Body = @{
    User = 'username'
    password = $password
}
$LoginResponse = Invoke-WebRequest -Uri  -Method Post -Headers @{"Content-Type" = "application/x-www-form-urlencoded"} `
-Body $Body -SessionVariable 'Session'

$Session
$LoginResponse