# Extensions - [Extending Pipelines](https://dev.ucommerce.net/readme/extensions/extending-pipelines.md): Modify system behavior by modifying Pipelines. - [Order Processing Pipelines](https://dev.ucommerce.net/readme/extensions/extending-pipelines/order-processing-pipelines.md) - [Checkout Pipelines](https://dev.ucommerce.net/readme/extensions/extending-pipelines/checkout-pipelines.md) - [Changing Service Behavior](https://dev.ucommerce.net/readme/extensions/change-service-behavior.md) - [Images](https://dev.ucommerce.net/readme/extensions/change-service-behavior/images.md) - [Content](https://dev.ucommerce.net/readme/extensions/change-service-behavior/content.md) - [Extend the Backoffice](https://dev.ucommerce.net/readme/extensions/extend-the-backoffice.md) - [Custom UI Components](https://dev.ucommerce.net/readme/extensions/extend-the-backoffice/custom-ui-components.md) - [Custom Editor UI](https://dev.ucommerce.net/readme/extensions/custom-editor-ui.md) - [Custom Promotion Criteria](https://dev.ucommerce.net/readme/extensions/extending-criteria.md): Promotion criteria in Ucommerce are used to determine when to trigger a discount on an order. - [Custom Price Group Criteria](https://dev.ucommerce.net/readme/extensions/custom-price-group-criteria.md): Price group criteria in Ucommerce are used to determine the accessibility of a price group. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://dev.ucommerce.net/readme/extensions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.