# Usage management

Use the **Usage** object to manage (add, update, delete, retrieve, and import) usage via the 2Checkout API (SOAP API 6.0).

The usage-based/on-demand/pay-as-you-go pricing model allows merchants to charge their customers on the consumption or overage of a billable service or resource, usually on top of a recurring flat rate. 

## Request parameters <a href="#parameters" id="parameters"></a>

| Parameters                | Type     | Required/Optional | Description                                                                                                                                                                                                                |
| ------------------------- | -------- | ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **UsageReference**        | Integer  | Optional          | The unique usage identifier. Example: 123459876.                                                                                                                                                                           |
| **SubscriptionReference** | String   | Required          | Unique code that represents a subscription. Example: 83FE4FEF2.                                                                                                                                                            |
| **OptionCode**            | String   | Required          | Unique 2Checkout option code. The pay-per-usage price options group for which the usage is uploaded. Example: metered pricing.                                                                                             |
| UsageStart                | Datetime | Required          | The datetime when the usage started; can be the same as UsageEnd.  Example: 2018-09-03 17:28:32.                                                                                                                           |
| **UsageEnd**              | Datetime | Required          | The datetime when the usage ended and was recorded. Example: 2018-09-03 17:28:32.                                                                                                                                          |
| **Units**                 | Integer  | Required          | Number of units recorded. Example: 10.                                                                                                                                                                                     |
| **Description**           | String   | Optional          | It can be used to store a short merchant comment of the usage being uploaded. This can be anything, from the source of usage (mobile, web, etc.), to why changes occurred, etc. Example: Subscription usage for September. |


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.2checkout.com/soap-api-reference/soap-api-6.0/api-requests/usage-management.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.