> For the complete documentation index, see [llms.txt](https://developer.firmhouse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.firmhouse.com/guides.md). # Guides - [Creating a Storefront App](https://developer.firmhouse.com/guides/creating-a-storefront-app.md): This guide covers a series of queries and mutations to handle typical storefront application scenarios. - [Updating the amount of discount on each order](https://developer.firmhouse.com/guides/updating-the-amount-of-discount-on-each-order.md): This guide shows you how to make a webhook handler that updates the discounts for a subscription on every order. - [Build a switch/upgrade plan flow that requires payment](https://developer.firmhouse.com/guides/build-a-switch-upgrade-plan-flow-that-requires-payment.md): Let your customers switch from their current plan to a new plan by making an initial payment. - [Setting up Shopify Native Checkout](https://developer.firmhouse.com/guides/setting-up-shopify-native-checkout.md) - [Adding selling plan options to your Shopify product pages](https://developer.firmhouse.com/guides/setting-up-shopify-native-checkout/adding-selling-plan-options-to-your-shopify-product-pages.md): This guide will help you integrate Selling Plan options into your Shopify store’s product pages --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://developer.firmhouse.com/guides.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.