# User Info

This section explains how to pass information about your app's users to the Nodefy API. This enables Nodefy to send targeted notifications to the right users and personalize the notification experience.

**Important Note:** We refer to the users of **your** application as **"External Users"** to distinguish them from the users who manage Nodefy accounts (internal users).

**Identifying External Users** (Optional)

If you are building notifications for many users, it is good practice to include a unique identifier for each user in the payload of your API requests. This identifier should be a string that you can use to identify the user (e.g., a user ID or email address). Use the field `external_user_id` for this purpose.


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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.nodefy.xyz/our-api-guide/user-info.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.