curl --request POST \
  --url https://api.agg.market/auth/start \
  --header 'Content-Type: application/json' \
  --header 'x-app-id: <api-key>' \
  --data '
{
  "provider": "google",
  "redirectUrl": "<string>"
}
'

{
  "type": "redirect",
  "url": "<string>"
}