Here is a neutral and interesting summary of how to add custom attributes to Twilio SMS campaigns: To add custom attributes to Twilio SMS campaigns, developers can use the optional status callback parameter in the create message post request. By appending a query string with the campaign ID to the status callback URL, developers can track campaign IDs and other metadata for each sent SMS message. This allows them to log activity, categorize digital marketing campaigns, and even track consumer trends. With the Twilio Node.js helper library, developers can easily implement this feature in their existing applications.