# Usage guidelines

This section provides important guidelines on how to use the **Mews POS API**. For a deeper understanding of **Mews** concepts, see [Concepts](/pos-api/concepts.md). For information about individual endpoints or operations, see [API Operations](/pos-api/operations.md).

> #### Terminology
>
> Some of the terms used in the API, such as *enterprise*, *customer* or *resource*, may not be familiar. For a full description of all the terms used, see the [Mews Glossary for Open API users](/getting-started/glossary.md).

## Contents

* [Authentication](/pos-api/guidelines/authentication.md)\
  Details of how API Operation requests are authenticated.
* [Requests](/pos-api/guidelines/requests.md)\
  Details of how to make API Operation requests.
* [Responses](/pos-api/guidelines/responses.md)\
  Details of API Operation responses, including error messages.
* [Environments](/pos-api/guidelines/environments.md)\
  A description of the different environments available and how to access them.
* [Relationships](/pos-api/guidelines/relationships.md)\
  How to work with resource relationships.
* [Filtering](/pos-api/guidelines/filtering.md)\
  How to use filtering when making requests.
* [Sparse fieldsets](/pos-api/guidelines/sparse-fieldsets.md)\
  How to request only data fields of interest when making requests.


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# 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://docs.mews.com/pos-api/guidelines.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.