# Developers - [Getting started](https://help.retainful.com/developers/getting-started.md): Integrate your apps, plugins and extensions with Retainful using our simple, developer-friendly RESTful API - [Authentication](https://help.retainful.com/developers/authentication.md): Learn how to authenticate your app or integration with Retainful in order to use the API - [Contacts](https://help.retainful.com/developers/contacts.md): Learn how to send contacts to Retainful API - [Lists](https://help.retainful.com/developers/lists.md): Learn how to retrieve the lists from Retainful API --- # 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://help.retainful.com/developers.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.