Tech team details SMS reliability strategy for fitness class waitlist notifications

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A development team encountered an issue where SMS notifications for expiring fitness class waitlist offers were sent but never confirmed as delivered, causing seats to be lost. They propose using SMS as a secondary, urgent channel for short-expiry offers while keeping core message logic within the application. The system should poll the SMS provider for delivery status until it reaches a terminal state like sent, delivered, or failed. Key safeguards include implementing per-user cooldowns, country allowlists, and spending limits on sends. The design emphasizes that the application must own the business logic and audit trail, not the SMS service provider.

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