Send RCS Message

Successfully sent or scheduled the message. Use our [/messages/:id](./get) endpoint to track your message. <Accordion title="About RCS Fallback SMS Response and RCS Fallback MMS Response"> Normally, when you send an RCS message with a fallback, the RCS message is attempted first — if delivery fails, the fallback SMS or MMS is sent afterward and you receive a `FALLBACK_SENT` webhook event. These response types are part of our new rollout that detects whether a recipient's phone is RCS-capable **before** the message is sent. If the phone does not support RCS, the fallback SMS or MMS is sent immediately — skipping the failed RCS attempt entirely. They can be ignored unless you have been specifically onboarded to use them. If you're interested, contact us at founders@trypinnacle.app. When you receive one of these responses, you will **not** receive a `FALLBACK_SENT` webhook event — the fallback was already sent in place of the RCS message. </Accordion>