curl --request POST \
  --url https://api.wacht.dev/auth/sso/login \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data organization_id=123456789012345678 \
  --data relay_url=https://app.example.com/sso/callback

{
  "sso_url": "<string>"
}