curl --request GET \
  --url https://sandbox.layerfi.com/v1/businesses/{businessId}/mileage/summary \
  --header 'Authorization: Bearer <token>'

{
  "years": [
    {
      "year": 123,
      "miles": "<string>",
      "business_miles": "<string>",
      "personal_miles": "<string>",
      "uncategorized_miles": "<string>",
      "estimated_deduction": 123,
      "trips": 123,
      "business_trips": 123,
      "personal_trips": 123,
      "uncategorized_trips": 123,
      "months": [
        {
          "month": 6,
          "miles": "<string>",
          "business_miles": "<string>",
          "personal_miles": "<string>",
          "uncategorized_miles": "<string>",
          "estimated_deduction": 123,
          "trips": 123,
          "business_trips": 123,
          "personal_trips": 123,
          "uncategorized_trips": 123,
          "deduction_rate": 123
        }
      ]
    }
  ]
}