> For the complete documentation index, see [llms.txt](https://learn.doubletick.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.doubletick.io/additonal-channels/rcs.md). # RCS Set up RCS on DoubleTick and learn how it compares to WhatsApp, and how to send one-on-one and broadcast RCS messages. RCS (Rich Communication Services) is a dedicated messaging channel on DoubleTick that sits alongside WhatsApp, letting you send rich, interactive messages straight to a customer's default messaging app. #### In this section * Getting started with RCS on DoubleTick * RCS vs WhatsApp Business API: which should you choose * How to send an RCS message in a one-on-one conversation * How to broadcast an RCS message * RCS frequently asked questions --- # 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 by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://learn.doubletick.io/additonal-channels/rcs.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.