How to Build an RCS Business Messaging Campaign with Twilio in C#

Rich Communication Services (RCS) Business Messaging extends SMS with native, branded features such as verified sender identities, rich cards, images, buttons, suggested replies, and read receipts, and Twilio enables these capabilities through its Programmable Messaging API. The tutorial explains how to create a .NET 10 C# campaign by registering an RCS Sender, attaching it to a Messaging Service, securely configuring Twilio credentials and service identifiers in environment variables, and programmatically creating a reusable Content API template with personalized variables, media, URL actions, and quick replies. It then uses a JSON recipient list to send individualized messages through the Messaging Service, which can fall back to SMS for unsupported devices, while a local ASP.NET webhook server receives status updates such as queued, sent, delivered, read, failed, and undelivered. A second inbound webhook processes suggested-reply payloads, returning TwiML responses for requests such as receiving a promotion code or unsubscribing. Finally, the guide uses ngrok to expose local endpoints, configures Twilio Console webhook URLs, demonstrates campaign testing, outlines common troubleshooting issues, and suggests production enhancements including CRM or database audiences, carousel content, persistent reporting, and webhook signature validation.

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