# Use cases - [Promotions](https://docs.commercelayer.io/rules-engine/use-cases/promotions.md): A list of the most common application scenarios of Commerce Layer Rules Engine to the flex promotion resource - [Discount line items based on item's price](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-fixed-amount-off-price-gteq.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Get a discount when paying by credit card](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-percentage-discount-credit-card.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Discount an order based on promo item and total number of items](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-percentage-discount-promo-item-number-of-items-gteq.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Offer a specific shipping method for free in a specific country](https://docs.commercelayer.io/rules-engine/use-cases/promotions/free-shipping-method-by-country.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Discount items with large stock availability](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-percentage-discount-quantity-gteq.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Discount all the SKU in an order based on the shipping country](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-percentage-discount-by-shipping-country.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Discount all the SKU in an order based on the customer email domain](https://docs.commercelayer.io/rules-engine/use-cases/promotions/get-percentage-discount-by-email.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Price lists](https://docs.commercelayer.io/rules-engine/use-cases/price-lists.md): A list of the most common application scenarios of Commerce Layer Rules Engine to the price list resource - [Discount all prices greater than or equal to a specific value](https://docs.commercelayer.io/rules-engine/use-cases/price-lists/discount-prices-gteq.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Discount specific SKUs for new clients](https://docs.commercelayer.io/rules-engine/use-cases/price-lists/discount-specific-skus-for-new-clients.md): Rule breakdown, resource payload analysis, and outcomes explanation - [Change strike-through price based on customer email domain](https://docs.commercelayer.io/rules-engine/use-cases/price-lists/update-compare-at-price-by-email.md): Rule breakdown, resource payload analysis, and outcomes explanation --- # 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://docs.commercelayer.io/rules-engine/use-cases.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.