curl --request GET \
  --url https://api.gcore.com/billing/v2/org/plans/{plan_pk}/content \
  --header 'Authorization: <api-key>'

{
  "count": 123,
  "next": "https://api.gcore.com/billing/v2/org/plans/{plan_pk}/content?offset=20&limit=10",
  "previous": "https://api.gcore.com/billing/v2/org/plans/{plan_pk}/content?offset=20&limit=10",
  "results": [
    {
      "id": 123,
      "plan_id": "<string>",
      "default": true,
      "plan_item": {
        "id": 123,
        "feature_id": 123,
        "feature_name": "<string>",
        "feature_metrics": [
          {
            "id": 123,
            "ext_name": "<string>",
            "int_name": "<string>"
          }
        ],
        "erp_sku_id": 123,
        "feature_regions": [
          {
            "id": 123,
            "ext_name": "<string>",
            "name_en": "<string>",
            "int_name": "<string>"
          }
        ],
        "product_category_id": 123,
        "product_category_name": "CDN",
        "calc_rule_id": 123,
        "calc_rule_name": "<string>",
        "calc_rule_type": "<string>",
        "unit_id": 123,
        "unit_name": "<string>",
        "unit_internal_name": "<string>",
        "unit_size": 1073741824,
        "price": {
          "id": 123,
          "currency_id": 123,
          "currency_code": "<string>",
          "money_value": "<string>",
          "price_stages": [
            {
              "id": 123,
              "threshold": "<string>",
              "money_value": "<string>"
            }
          ]
        },
        "default_value": "<string>",
        "rounding_rule": {
          "id": 123,
          "unit_id": 123,
          "unit_name": "<string>",
          "round_operation": "ceil",
          "value": "<string>"
        },
        "check_threshold": true,
        "comment": "<string>"
      }
    }
  ]
}