curl --request GET \
  --url https://app.allyy.io/api/model/v1.0/customer/{customerId}/modeltraining/{trainingId}/statistics/waterfall \
  --header 'Authorization: Bearer <token>'

{
  "meta": {
    "errors": [
      {
        "code": "<string>",
        "message": "<string>"
      }
    ],
    "validation": [
      {
        "property": "<string>",
        "message": "<string>"
      }
    ],
    "info": {}
  },
  "data": {
    "percentileIndex": 0,
    "fileIndex": 123,
    "baseValue": 123,
    "shapSum": 123,
    "features": [
      {
        "featureId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "featureName": "<string>",
        "originalName": "<string>",
        "featureValue": "<string>",
        "shapValue": 123,
        "cumulativeShapValue": 123,
        "dataValue": 123
      }
    ]
  }
}