# Usage guides

In this section, you will find examples of how to use various functionalities provided by our APIs.

{% hint style="info" %}
Remember, to use the API, you will need your personal API key.[`how to get the key?`](https://docs.proxy-seller.com/mobile-crm/get-authorization-key)
{% endhint %}

### How to Work with API Reference

All about working with API Referense

{% content-ref url="usage-guides/how-to-work-with-api-reference" %}
[how-to-work-with-api-reference](https://docs.proxy-seller.com/mobile-crm/usage-guides/how-to-work-with-api-reference)
{% endcontent-ref %}

### Host actions

All about host communications

{% content-ref url="usage-guides/host-actions" %}
[host-actions](https://docs.proxy-seller.com/mobile-crm/usage-guides/host-actions)
{% endcontent-ref %}

### Modem actions

All about modem communications

{% content-ref url="usage-guides/modem-actions" %}
[modem-actions](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-actions)
{% endcontent-ref %}

### Modem authorization (user) actions

All about modem authorization (user) communications

{% content-ref url="usage-guides/modem-authorization-users" %}
[modem-authorization-users](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-authorization-users)
{% endcontent-ref %}

### Modem action links

All about modem direct action links

{% content-ref url="usage-guides/modem-action-links" %}
[modem-action-links](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-action-links)
{% endcontent-ref %}