# Core API integration

- [Order rules](https://docs.commercelayer.io/rules-engine/core-api-integration/order-rules.md): How the Rules Engine integration with Commerce Layer Core API promotions resource works behind the scenes
- [Price rules](https://docs.commercelayer.io/rules-engine/core-api-integration/price-rules.md): How the Rules Engine integration with Commerce Layer Core API price lists resource works behind the scenes
- [Virtual relationships](https://docs.commercelayer.io/rules-engine/core-api-integration/virtual-relationships.md): How to leverage the JSON Web Token info to create rules


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