# Concepts - [Staging Environment](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/staging-environment.md): This section walks you through the process of testing our different API in a staging environment. - [Catalog](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/catalog-refresh.md): Xoxoday offers a vast collection of vouchers that can be ordered via the Rewards API. - [Error Handling](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/errors.md): Xoxoday Plum Pro API uses conventional HTTP status codes to indicate success or failure. Responses with a status code starting with 4xx or 5xx can be considered as failed. The API returns errors in JS - [Standard HTTP status code summary](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/errors/standard-http-status-code-summary.md) - [Errors related to API](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/errors/errors-related-to-api.md) - [Exchange Rates](https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts/exchange-rates-1.md): This section deals with exchange rates during currency conversion. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://xoxoday.gitbook.io/plum/developer-resources/overview-of-reward_api/concepts.md?ask= ``` 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.