# Cart - [Apply a shopper to a cart](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/apply-a-shopper-to-a-cart.md) - [Line items](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/line-items.md) - [Billing address](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/billing-address.md) - [Shipping address](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/shipping-address.md) - [Payment methods](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/payment-methods.md) - [Shipping options](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/shipping-options.md) - [Web checkout](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/web-checkout.md) - [Submit a cart](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/submit-a-cart.md) - [Apply or detach payment methods](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/apply-or-detach-payment-methods.md) - [Apply a shipping option](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/apply-a-shipping-option.md) - [Carts](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/carts.md) - [Cart offers](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/cart-offers.md) - [API trigger offer](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/api-trigger-offer.md) - [Resume cart](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/resume-cart.md) - [Third-party subscription engine](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/third-party-subscription-engine.md) - [Tax registration](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/tax-registration.md) - [Price override](https://docs.digitalriver.com/commerce-api-references/shopper-apis/cart/price-override.md) --- # 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.digitalriver.com/commerce-api-references/shopper-apis/cart.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.