curl --request GET \
  --url https://api.example.com/partners/referrers/{user_id}/stats/daily \
  --header 'X-API-Key: <api-key>'

{
  "items": [
    {
      "date": "<string>",
      "referrals_count": 123,
      "earnings_kopeks": 123
    }
  ],
  "days": 123,
  "user_id": 123
}