Get account's referral info

curl --request GET \
  --url https://backend.swap.coffee/v1/referral/{address} \
  --header 'x-verify: <x-verify>'

{
  "link": "<string>",
  "level": 123,
  "fees_percentage": 123,
  "referrals_count": 123,
  "transactions_count": 123,
  "rewards": {
    "monthly": {
      "volume": 123,
      "fees": 123
    },
    "total": {
      "volume": 123,
      "fees": 123
    }
  }
}