curl --request GET \
  --url https://api.sprucecollective.co.uk/reports/quantity-distribution \
  --header 'Authorization: <api-key>'

{
  "box_plot": {
    "max": 123,
    "median": 123,
    "min": 123,
    "q1": 123,
    "q3": 123
  },
  "buckets": [
    {
      "count": 123,
      "cumulative_percent": 123,
      "label": "<string>",
      "max": 123,
      "min": 123,
      "revenue_cents": 123
    }
  ]
}