Here is a 1-paragraph summary of the text: To send RCS messages with Ruby and Twilio, developers can start by creating an RCS sender in the Twilio Console, adding profile information such as a display name, description, and logo, and testing the sender on an RCS-capable device. Next, they create a messaging service and optionally set up webhook integration to handle incoming messages. The developer then copies the Messaging Service SID and creates a Ruby script to send their first RCS message, which can be used as a starting point for exploring advanced RCS features such as rich message content and programmable messaging logs.