> For the complete documentation index, see [llms.txt](https://docs.commercelayer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.commercelayer.io/core-api-reference/vertex_accounts.md).

# Vertex accounts

Configure your [Vertex](https://www.vertexinc.com/) account to automatically compute tax calculations for the orders of the associated market.

Based on the [Vertex O Series](https://www.vertexinc.com/solutions/products/vertex-indirect-tax-o-series) type of solution you choose (set as the value of the `kind` attribute), the configuration might slightly differ, for example for what the base URL used to compose the appropriate endpoint URL to which the integration submits the request for an access token is concerned. Specifically, as detailed in the [Vertex API documentation](https://developer.vertexinc.com/oseries/docs/authentication-os#local-token-caching):

* **O Series Cloud** — Fixed URL with no base URL attached.
* **O Series On-Demand** — The base URL is a second-level domain.
* **O Series On-Premise** — You need to use your full server domain as the base URL.

{% hint style="warning" %}
Due to what was mentioned above, when creating a Vertex account, the `baseurl` attribute is optional only if the `kind` is `cloud`.
{% endhint %}


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