> 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/order_validation_rules.md).

# Order validation rules

The order validation rule object and the allowed CRUD operations on the related resource endpoint

Order validation rules represent all of the validation rules that apply to the orders associated with a specific market (i.e. [billing info validation rule](/core-api-reference/billing_info_validation_rules.md)).

{% hint style="info" %}
This is an **immutable API**, meaning that create, update, and delete operations are not allowed on this endpoint. You can only fetch a list of order validation rules or a single order validation rule object.
{% endhint %}


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