# Getting started

The Commerce Layer Rules Engine is a *Domain-Specific Language (DSL)* used for defining rules that can support from the simplest to the most complex logic. The [rules](/rules-engine/rules.md) can be evaluated against a specific payload to check if the requested [conditions](#conditions) are met so that the respective [actions](/rules-engine/actions.md) will be applied.

{% hint style="success" icon="robot" %}
Commerce Layer documentation is [LLM-ready](/readme.md#llm-friendly)! To feed the knowledge base into your own LLM, read [this file](https://docs.commercelayer.io/llms.txt).
{% endhint %}

## Core API integration

The Rules Engine is currently [integrated](/rules-engine/core-api-integration/order-rules.md) with Commerce Layer [Core API](https://docs.commercelayer.io/core/) to enable the creation and management of a super-flexible promotional system that covers a wide set of [use cases](/rules-engine/use-cases/promotions.md).

The Rules Engine integration is currently enabled for a subset of [resources](/rules-engine/resources/promotions.md): at the moment [promotions](#order-rules) and [price lists](#price-rules) are available (more to come).

{% hint style="success" %}
When defining fields and selectors for the [conditions](/rules-engine/conditions.md) and [actions](/rules-engine/actions.md) of a [rule](/rules-engine/rules.md), use the [dot notation](https://idratherbewriting.com/learnapidoc/docapis_diving_into_dot_notation.html) to navigate the relationship tree down to the desired attribute or related resource of Commerce Layer Core API. For more information explore the [data model](https://commercelayer.io/docs/data-model) and [API reference](https://docs.commercelayer.io/core-api-reference/), or double-check the public [resources schema](https://core.commercelayer.io/api/public/resources.json).
{% endhint %}

{% hint style="info" %}
Most of the examples and JSON snippets used in the following sections to illustrate how the Rules Engine works refer to [order rules](/rules-engine/core-api-integration/order-rules.md). You can easily use them as a reference to create [price rules](/rules-engine/core-api-integration/price-rules.md) or other rules related to any possible future Rule Engine integrations.
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