> ## Documentation Index
> Fetch the complete documentation index at: https://developer.z-api.io/llms.txt
> Use this file to discover all available pages before exploring further.

# ID and Token

> Understand how authentication works in Z-API

## What is it and what is it for?

To communicate between APIs, we need to establish a security protocol between the parties. Therefore, every interaction you make with Z-API will require your authentication credentials. These credentials compose the integration URL with Z-API, as shown in the example below:

```
https://api.z-api.io/instances/YOUR_INSTANCE/token/YOUR_TOKEN/send-text
```

***

## How do I get my ID and Token?

After creating your Z-API account and setting up an instance, you will have two pieces of information that identify and secure the communication between your application and Z-API. To access and view your instance details, simply click edit on the desired instance within the admin panel. You can have multiple instances, each with unique credentials.

<Warning>
  Never share your ID and token with anyone — anyone who has this information can send messages on your behalf. Your API calls should be made from a server, never from the frontend, to prevent exposing your authentication data.
</Warning>