Get a funnel report (stages)

The opportunity funnel "stages" report returns the pipeline funnel's metrics for the selected opportunities, aggregated (JSON format only) and per-user (JSON and CSV formats). Every report accepts the following parameters: * `pipeline`: ID of the pipeline defining the funnel statuses. * `type`: the type of the report. The available values are `created-cohort` and `active-stage-cohort`. * `report_relative_range`: a relative time range to fetch data for. The allowed values are: `today`, `this-week`, `this-month`, `this-quarter`, `this-year`, `yesterday`, `last-week`, `last-month`, `last-quarter`, `last-year`, and `all-time`. * `report_datetime_range`: a time range to fetch data for. * `cohort_relative_range`: a relative time range defining the cohort of created opportunities to fetch data for, by date of creation of those opportunities. The allowed values are: `today`, `this-week`, `this-month`, `this-quarter`, `this-year`, `yesterday`, `last-week`, `last-month`, `last-quarter`, `last-year`, and `all-time`. Either this field or `cohort_datetime_range` needs to be specified for `created-cohort` reports. Its value will be ignored for `active-stage-cohort` reports. * `cohort_datetime_range`: a time range defining the cohort of created opportunities to fetch data for, by date of creation of those opportunities. Either this field or `cohort_relative_range` needs to be specified for `created-cohort` reports. Its value will be ignored for `active-stage-cohort` reports. * `compared_relative_range`: a relative time range to fetch comparison data for. Only allowed in combination with `report_relative_range` (for `active-stage-cohort` reports) or `cohort_relative_range` (for `created-cohort` reports). The allowed values are: `today`, `this-week`, `this-month`, `this-quarter`, `this-year`, `yesterday`, `last-week`, `last-month`, `last-quarter`, `last-year`, and `all-time`. * `compared_datetime_range`: a relative time range to fetch comparison data for. Only allowed in combination with `report_datetime_range` (for `active-stage-cohort` reports) or `cohort_datetime_range` (for `created-cohort` reports). The allowed values are: `same-days-last-week`, `same-days-last-month`, `same-days-last-quarter`, `same-days-last-year`. * `compared_custom_range`: a time range to fetch comparison data for. * `query`: a query to apply to the report to filter out data. The value of the field is a dictionary with the key `type` and any type-specific keys. For now only the type `saved_search` is allowed which takes the extra key `saved_search_id` to specify the ID of a saved search. This parameter is *optional*. * `users`: a list of user IDs or group IDs to limit the report results to. When it's empty, the report will include all the available users. This parameter is *optional*. The report can be requested either in JSON format or in CSV format. The format can be specified with the `accept` header. In JSON format, it includes aggregated and per-user data. When requested in CSV format, it includes only per-user data. When `compared_datetime_range`, `compared_relative_range`, or `compared_custom_range` are used, the report returned is the compared one, not the base one.