curl --request GET \
  --url https://api.tread-horizon.com/v1/rates/{rate-id}/auto_add_on_assignments \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "quantity": "<string>",
      "rate": "<string>",
      "percentage": "<string>",
      "add_on_rate_type": "RateForEach",
      "external_id": "<string>",
      "accounting_id": "<string>",
      "add_on_types": [
        "driver_pay"
      ],
      "total_installments": 123,
      "auto_add_on_installments_count": 123,
      "revenue_rate_value": "<string>",
      "revenue_cost_rate_type": "RateForEach",
      "cost_rate_value": "<string>",
      "account_type": "customer",
      "add_on_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "original_auto_add_on_assignment_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "source_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "source_type": "Settlement",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "add_on": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "name": "<string>",
        "quantity": "<string>",
        "rate": "<string>",
        "percentage": "<string>",
        "add_on_rate_type": "RateForEach",
        "fuel_surcharge_schedule": {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "name": "<string>"
        }
      }
    }
  ]
}