> For the complete documentation index, see [llms.txt](https://developer.flash-payments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.flash-payments.com/basics.md). # Basics - [Why GraphQL](https://developer.flash-payments.com/basics/why-graphql.md): General information how to start using Flash Payments API - [Sending data as JSON](https://developer.flash-payments.com/basics/sending-data-as-json.md): Here is how to send your data to us as JSON instead of embedding it into the GraphQL queries. - [Authentication](https://developer.flash-payments.com/basics/authentication.md): Get your access token - [Required fields](https://developer.flash-payments.com/basics/required-fields.md): Here is how to identify the mandatory input fields for your GraphQL queries and mutations. - [Webhooks](https://developer.flash-payments.com/basics/webhooks.md): Two types of the webhooks - [Ad hoc webhooks](https://developer.flash-payments.com/basics/webhooks/adhoc-webhooks.md): How to secure your callback endpoints - [Regular webhooks](https://developer.flash-payments.com/basics/webhooks/regular-webhooks.md): How to setup web hooks for your integration - [API change log](https://developer.flash-payments.com/basics/api-change-log.md): History of changes to this API schema --- # 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.flash-payments.com/basics.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.