# Retrieve usage rate detail for an invoice item

Use this REST API operation to retrieve the usage rate detail for an invoice item to understand how the total amount is calculated. The information is the same as the Rate Detail presented on [PDF invoices](https://docs.zuora.com?resourceId=billing-display-usage-charge-breakdown).
**Notes and limitations:**
- Do not support the Overage Charge Model, Tiered with Overage Charge Model, and Multi-attribute Pricing Charge Model.
- Do not support invoices in `Cancelled` or `Reversed` status.
- Do not support Active rating.
- In terms of rating group options, only the [Usage rating by billing period](https://docs.zuora.com?resourceId=billing-usage-rating-by-billing-period) is supported.
- Do not support [On-demand usage rating](https://docs.zuora.com?resourceId=billing-on-demand-usage-rating).
- Tax calculation is not involved.

Endpoint: GET /v1/invoices/invoice-item/{invoice-item-id}/usage-rate-detail
Version: 2026-10-16
Security: bearerAuth

## Security:

  - `bearerAuth` (unknown)
    http bearer

## Path parameters:

  - `invoice-item-id` (string, required)
    Invoice item ID. For example, `402880e57f725d85017f7267c4ad002b`. Available through Data Source export.

## Header parameters:

  - `Accept-Encoding` (string)
    Include the `Accept-Encoding: gzip` header to compress responses as a gzipped file. It can significantly reduce the bandwidth required for a response. 

If specified, Zuora automatically compresses responses that contain over 1000 bytes of data, and the response contains a `Content-Encoding` header with the compression algorithm so that your client can decompress it.

  - `Content-Encoding` (string)
    Include the `Content-Encoding: gzip` header to compress a request. With this header specified, you should upload a gzipped file for the request payload instead of sending the JSON payload.

  - `Zuora-Track-Id` (string)
    A custom identifier for tracing the API call. If you set a value for this header, Zuora returns the same value in the response headers. This header enables you to associate your system process identifiers with Zuora API calls, to assist with troubleshooting in the event of an issue.

The value of this field must use the US-ASCII character set and must not include any of the following characters: colon (`:`), semicolon (`;`), double quote (`"`), and quote (`'`).

  - `Zuora-Entity-Ids` (string)
    An entity ID. If you have [Zuora Multi-entity](https://docs.zuora.com?resourceId=platform-multi-entity-overview) enabled and the OAuth token is valid for more than one entity, you must use this header to specify which entity to perform the operation in. If the OAuth token is only valid for a single entity, or you do not have Zuora Multi-entity enabled, you should not set this header.

  - `Zuora-Org-Ids` (string)
    Comma separated IDs. If you have <a href="https://docs.zuora.com/en/zuora-platform/organization-and-entity-management/multi-org/overview-of-multi-org" target="_blank">Zuora Multi-Org</a> enabled, 
you can use this header to specify which orgs to perform the operation in. If you do not have Zuora Multi-Org enabled, you should not set this header.

The IDs must be a sub-set of the user's accessible orgs. If you specify an org that the user does not have access to, the operation fails. This header is important in Multi-Org (MO) setups because it defines the organization context under which the API should operate—mainly used for read access or data visibility filtering. If the header is not set, the operation is performed in scope of the user's accessible orgs.

  - `Zuora-Version` (string)
    The minor API version.

For a list of available minor versions, see [API upgrades](https://developer.zuora.com/v1-api-reference/api-upgrades/).

## Response 200:

  - `200` (unknown)
    OK

## Response 200 fields (application/json):

  - `data` (object)
    Contains usage rate details for the invoice item as specified in the request.

  - `data.amountWithoutTax` (number)
    The amount of the invoice item without tax.

  - `data.chargeNumber` (string)
    The unique number of the product rate plan charge associated with the invoice item.

  - `data.invoiceId` (string)
    The unique ID of the invoice.

  - `data.invoiceItemId` (string)
    The unique ID of the invoice item.

  - `data.invoiceNumber` (string)
    The unique number of the invoice.

  - `data.listPrice` (string)
    The list price of the product rate plan charge associated with the invoice item. For example, if the product rate plan charge uses the tiered charge model, its list price could be:
Tier / From / To / List Price / Price Format\n1 / 0 / 9 / 0.00 / Per Unit\n2 / 10 / 20 / 1.00 / Per Unit\n3 / 21 / 30 / 2.00 / Flat Fee\n4 / 31 /   / 3.00 / Per Unit\n

  - `data.quantity` (number)
    The quantity of the invoice item.

  - `data.rateDetail` (string)
    The rate detail of the invoice item. It shows how the total amount is calculated. For example, if the product rate plan charge uses the tiered charge model, the rate detail for the associated invoice item could be:
Tier 1: 0-9, 9 Each(s) x $0.00/Each = $0.00\nTier 2: 10-20, 11 Each(s) x $1.00/Each = $11.00\nTier 3: 21-30, $2.00 Flat Fee\nTier 4: >=31, 15 Each(s) x $3.00/Each = $45.00\nTotal = $58.00.
The rate detail retrieved from this REST API operation is the same as the [Rate Detail presented on PDF invoices](https://docs.zuora.com?resourceId=billing-display-usage-charge-breakdown).

  - `data.servicePeriod` (string)
    The service period of the invoice item.

  - `data.uom` (string)
    The unit of measurement of the invoice item.

  - `success` (boolean)
    Returns `true` if the request was processed successfully.
Returns `false` if the request was not processed successfully.

## Response 200 headers (application/json):

  - `Content-Encoding` (string)
    This header is returned if you specify the `Accept-Encoding: gzip` request header and the response contains over 1000 bytes of data.

Note that only the following MIME types support gzipped responses:
  - `application/json`
  - `application/xml`
  - `text/html`
  - `text/csv`
  - `text/plain`

  - `RateLimit-Limit` (string)
    The request limit quota for the time window closest to exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Remaining` (number)
    The number of requests remaining in the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Reset` (number)
    The number of seconds until the quota resets for the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `Zuora-Request-Id` (string)
    The Zuora internal identifier of the API call. You cannot control the value of this header.

  - `Zuora-Track-Id` (string)
    A custom identifier for tracing the API call. 
If you specified a tracing identifier in the request headers, Zuora returns the same tracing identifier. 
Otherwise, Zuora does not set this header.

  - `Concurrency-Limit-Type` (string)
    The type of the concurrency limit, which can be `Default`, `High-volume transactions`, or `Object Query`.

For more information, see [Concurrent request limits](https://developer.zuora.com/docs/guides/rate-limits/#concurrent-request-limits).

  - `Concurrency-Limit-Limit` (integer)
    The total number of the permitted concurrent requests.

For more information, see [Concurrent request limits](https://developer.zuora.com/docs/guides/rate-limits/#concurrent-request-limits).

  - `Concurrency-Limit-Remaining` (integer)
    The remaining number of the permitted concurrent requests.

For more information, see [Concurrent request limits](https://developer.zuora.com/docs/guides/rate-limits/#concurrent-request-limits).

## Response 500:

  - `500` (unknown)
    Internal Server Error

## Response 500 fields (application/json):

  - `reasons` (array)

  - `reasons.code` (string)
    The error code of response.

  - `reasons.message` (string)
    The detail information of the error response

## Response 500 headers (application/json):

  - `Content-Encoding` (string)
    This header is returned if you specify the `Accept-Encoding: gzip` request header and the response contains over 1000 bytes of data.

Note that only the following MIME types support gzipped responses:
  - `application/json`
  - `application/xml`
  - `text/html`
  - `text/csv`
  - `text/plain`

  - `RateLimit-Limit` (string)
    The request limit quota for the time window closest to exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Remaining` (number)
    The number of requests remaining in the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Reset` (number)
    The number of seconds until the quota resets for the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `Zuora-Request-Id` (string)
    The Zuora internal identifier of the API call. 
You cannot control the value of this header.

  - `Zuora-Track-Id` (string)
    A custom identifier for tracing the API call. 
If you specified a tracing identifier in the request headers, Zuora returns the same tracing identifier. 
Otherwise, Zuora does not set this header.

## Response 4XX:

  - `4XX` (unknown)
    Request Errors

## Response 4XX fields (application/json):

  - `processId` (string)
    The ID of the process that handles the operation.

  - `reasons` (array)
    The container of the error code and message. This field is available only if the `success` field is `false`.

  - `reasons.code` (string)
    The error code of response.

  - `reasons.message` (string)
    The detail information of the error response

  - `requestId` (string)
    Unique identifier of the request.

  - `success` (boolean)
    Indicates whether the call succeeded.

## Response 4XX headers (application/json):

  - `Content-Encoding` (string)
    This header is returned if you specify the `Accept-Encoding: gzip` request header and the response contains over 1000 bytes of data.

Note that only the following MIME types support gzipped responses:
  - `application/json`
  - `application/xml`
  - `text/html`
  - `text/csv`
  - `text/plain`

  - `RateLimit-Limit` (string)
    The request limit quota for the time window closest to exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Remaining` (number)
    The number of requests remaining in the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `RateLimit-Reset` (number)
    The number of seconds until the quota resets for the time window closest to quota exhaustion. See [rate limits](https://developer.zuora.com/docs/guides/rate-limits/) for more information.

  - `Zuora-Request-Id` (string)
    The Zuora internal identifier of the API call. 
You cannot control the value of this header.

  - `Zuora-Track-Id` (string)
    A custom identifier for tracing the API call. 
If you specified a tracing identifier in the request headers, Zuora returns the same tracing identifier. 
Otherwise, Zuora does not set this header.

## Response 200 examples:

  - `response` (unknown)

## Response 500 examples:

  - `response` (unknown)

## Response 4XX examples:

  - `response` (unknown)