# Connect Fundamentals

{% hint style="info" %}
Different articles covering basics of our API like Authentication, standards and common rules etc.
{% endhint %}

{% content-ref url="fundamentals/lhv-certificates" %}
[lhv-certificates](https://docs.lhv.com/home/connect/fundamentals/lhv-certificates)
{% endcontent-ref %}

{% content-ref url="fundamentals/authentication" %}
[authentication](https://docs.lhv.com/home/connect/fundamentals/authentication)
{% endcontent-ref %}

{% content-ref url="fundamentals/messaging" %}
[messaging](https://docs.lhv.com/home/connect/fundamentals/messaging)
{% endcontent-ref %}