Send SMS and Facebook Messenger Messages via Automations

🔍 Problem Statement

As a business user, I can only send campaigns to my segments over email, which limits reach to customers who don't engage by email.

💡 User Story

As a business user, I want to send campaigns to my existing segments via SMS and Facebook Messenger, so that I can reach customers on their preferred channel.

🎯 Definition of Done (DoD)

✔ Given a segment in the automation tool, when a business user creates a campaign, then they can select email, SMS, or Facebook Messenger as the send channel and the message is delivered to that segment.

✔ This change will impact UI, API, and Integration, specifically the campaign/automation engine and the Integration Orchestrator (Twilio for SMS, Messenger Platform API for Facebook).

✔ This solution will include the following limitations: [clarify SMS provider]; sends to existing segments only; [clarify whether inbound replies are handled].