curl --request GET \
  --url https://vcm-fyi-api.fly.dev/v1/buyers/{buyer_name} \
  --header 'X-API-KEY: <api-key>'

{
  "buyer_name": "<string>",
  "total_volume": 123,
  "volume_12m": 123,
  "volume_60d": 123,
  "avg_transaction_size": 123,
  "total_transactions": 123,
  "transactions_12m": 123,
  "transactions_60d": 123,
  "transactions_per_year": 123,
  "first_purchase": "2023-12-25",
  "last_purchase": "2023-12-25",
  "days_since_last": 123,
  "top_category": "<string>",
  "top_country": "<string>",
  "top_registry": "<string>",
  "is_active_12m": true,
  "is_active_60d": true
}