# Pipelines # What are the available pipelines?
**Pipeline** **Description**
`\Aero\Store\Pipelines\ContentForBody`Builds content string to be injected into the body of all pages.
`\Aero\Store\Pipelines\ContentForHead`Builds content string to be injected into the head of all pages.
`\Aero\Store\Pipelines\RobotsTxt`Used to defined/generate a robots.txt file.
`\Aero\Store\Pipelines\CartItemBuilder`Run whenever a cart item is added to the cart in order to build the item from the request data.
`\Aero\Cart\Pipelines\OrderItemBuilder`Run whenever a cart item is transformed into an order item.
`\Aero\Subscription\Pipelines\SubscriptionOrderBuilder`Run when a subscription is processed and requires a new order to be created.
`\Aero\Admin\Pipelines\ListingRulesContextBuilder` Builds listing rule context for each rule type.
`\Aero\Admin\Pipelines\ListingRulesDataFormatter`Formats listing rules for admin UI.
`\Aero\Admin\Pipelines\PreviewMailAction` Builds a temporary mail action to be previewed.
`\Aero\Admin\Reports\Pipelines\BuyXDiscountTierReportQuery`Builds the query for the buy x discount tier report.
`\Aero\Admin\Reports\Pipelines\DiscountCodesReportQuery`Builds the query for the discount codes report.
`\Aero\Admin\Reports\Pipelines\OrderBreakdownReportQuery`Builds the query for the order breakdown report.
`\Aero\Admin\Reports\Pipelines\OrderSurchargeReportQuery`Builds the query for the order surcharge report.
`\Aero\Admin\Reports\Pipelines\ProductStockLevelReportQuery`Builds the query for the product stock level report.
`\Aero\Admin\Reports\Pipelines\RefundReportQuery`Builds the query for the refund report.
`\Aero\Admin\Reports\Pipelines\SalesReportQuery`Builds the query for the sales report.
`\Aero\Admin\Reports\Pipelines\VoucherReportQuery`Builds the query for the voucher report.
`Aero\Admin\Configuration\Groups\PaymentAndShippingConfigurationGroup`Builds the payment and shipping configuration group.
`Aero\Admin\Configuration\Groups\OrderManagementConfigurationGroup`Builds the order management configuration group.
`Aero\Admin\Configuration\Groups\LocalizationConfigurationGroup`Builds the localization configuration group.
`Aero\Admin\Configuration\Groups\ProductManagementConfigurationGroup`Builds the product management configuration group.
`Aero\Admin\Configuration\Groups\NotificationsConfigurationGroup`Builds the notifications configuration group.
`Aero\Admin\Configuration\Groups\TaxConfigurationGroup`Builds the tax configuration group.
`Aero\Admin\Configuration\Groups\SystemConfigurationGroup`Builds the system configuration group.
`Aero\Admin\Configuration\Groups\UserManagementConfigurationGroup`Builds the user management configuration group.
`Aero\Admin\Configuration\Groups\MaintenanceConfigurationGroup`Builds the maintenance configuration group.
`Aero\DataPort\Commands\Pipelines\ImportBlockCSVPipeline`Creates a block from CSV data.
`Aero\DataPort\Commands\Pipelines\ImportProductCSVPipeline`Creates a product from CSV data.
`\Aero\Store\Pipelines\ListingsPageQuery`Builds the query for the listings page.
`Aero\Search\Elastic\Pipelines\ProductAttributes`Builds the attributes for the ES Product model
`Aero\Search\Elastic\Pipelines\ListingAttributes`Builds the attributes for the ES Listing model
`Aero\Search\Elastic\Pipelines\ListingCategory`Builds listing documents `categories` data.
`Aero\Search\Elastic\Pipelines\ListingCategoryFacet`Builds listing documents category string facet data.
`Aero\Search\Elastic\Pipelines\ListingManufacturerFacet`Builds listing documents manufacturer string facet data.
`Aero\Search\Elastic\Pipelines\ListingTagFacet`Builds listing documents tag string facet data.
`Aero\Search\Elastic\Pipelines\Mapping`Used to build the ES Mapping for search documents.
# How do I extend pipelines? The payload data can be altered using the `extend()` method. This is typically done from within a Service Provider: - If the code is unique to a particular store it could be placed in the `boot()` method of the `AppServiceProvider`. - If it is to be included as part of a module, then it can be added to the setup method of the module's Service Provider. For example, if a module needs to add an option to items to flag them as requiring gift wrap, the `CartItemBuilder` pipeline class should be extended in the module's ServiceProvider as shown below: ```php has('gift_wrap')) { $option = CartItemOption::create('Gift wrap'); $item->addOption($option); } }); } } ```