curl --request GET \
  --url https://app.herondata.io/api/end_users/{end_user_id_or_heron_id}/merchant_summary \
  --header 'x-api-key: <api-key>'

{
  "by_merchant_summary": [
    {
      "group": "<string>",
      "heron_id": "<string>",
      "inflow_metrics": {
        "amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "changed_in_last_90_days": true,
        "count": 123,
        "duration_days": 123,
        "estimated_monthly_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "frequency": "not_enough_data",
        "is_active": true,
        "max_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "max_timestamp": "2023-11-07T05:31:56Z",
        "mean_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mean_interval_days": 123,
        "median_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_timestamp": "2023-11-07T05:31:56Z",
        "mode_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mode_interval_days": 123,
        "std_dev_amount": {
          "amount": "1234.56",
          "currency": "USD"
        }
      },
      "name": "<string>",
      "net_metrics": {
        "amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "changed_in_last_90_days": true,
        "count": 123,
        "duration_days": 123,
        "estimated_monthly_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "frequency": "not_enough_data",
        "is_active": true,
        "max_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "max_timestamp": "2023-11-07T05:31:56Z",
        "mean_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mean_interval_days": 123,
        "median_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_timestamp": "2023-11-07T05:31:56Z",
        "mode_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mode_interval_days": 123,
        "std_dev_amount": {
          "amount": "1234.56",
          "currency": "USD"
        }
      },
      "outflow_metrics": {
        "amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "changed_in_last_90_days": true,
        "count": 123,
        "duration_days": 123,
        "estimated_monthly_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "frequency": "not_enough_data",
        "is_active": true,
        "max_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "max_timestamp": "2023-11-07T05:31:56Z",
        "mean_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mean_interval_days": 123,
        "median_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "min_timestamp": "2023-11-07T05:31:56Z",
        "mode_amount": {
          "amount": "1234.56",
          "currency": "USD"
        },
        "mode_interval_days": 123,
        "std_dev_amount": {
          "amount": "1234.56",
          "currency": "USD"
        }
      },
      "transactions": [
        {
          "amount": {
            "amount": "1234.56",
            "currency": "USD"
          },
          "category": {
            "heron_id": "<string>",
            "label": "<string>"
          },
          "description": "<string>",
          "heron_id": "<string>",
          "timestamp": "2023-11-07T05:31:56Z"
        }
      ]
    }
  ]
}