# Received APIs Intro

Received's API operates on a REST architecture, featuring resource-oriented URLs for easy navigation. It accepts form-encoded request bodies and delivers JSON-encoded responses. Standard HTTP response codes, authentication methods, and verbs are utilized throughout.

#### API Headers

{% hint style="info" %}
API calls, except for Authentications, must include the next headers

1. **Bearer Token** - return from the login call 
2. **API Version** - {"Version": "V0"}
   {% endhint %}

#### Current version

{% code lineNumbers="true" %}

```javascript
{"Version": "V0"}
```

{% endcode %}

#### **Start using with Swagger UI:**

{% hint style="info" %}
<https://api.received.ai/swagger/>
{% endhint %}